# List of Star Trek characters (A–F)

This article lists characters of Star Trek in their various canonical incarnations. This includes fictional major characters and fictional minor characters created for Star Trek, fictional characters not originally created for Star Trek, and real-life persons appearing in a fictional manner, such as holodeck re-creations.

## Characters from all series, listed alphabetically
### Key

| Abbreviation | Title | Date(s) | Medium |
| TC | "The Cage" (Star Trek: The Original Series) | 1966 | TV |
| TOS | Star Trek: The Original Series | 1966–1969 | TV |
| TAS | Star Trek: The Animated Series | 1973–1974 | TV |
| TMP | Star Trek: The Motion Picture | 1979 | film |
| TWOK | Star Trek II: The Wrath of Khan | 1982 | film |
| TSFS | Star Trek III: The Search for Spock | 1984 | film |
| TVH | Star Trek IV: The Voyage Home | 1986 | film |
| TFF | Star Trek V: The Final Frontier | 1989 | film |
| TUC | Star Trek VI: The Undiscovered Country | 1991 | film |
| TNG | Star Trek: The Next Generation | 1987–1994 | TV |
| DS9 | Star Trek: Deep Space Nine | 1993–1999 | TV |
| GEN | Star Trek Generations | 1994 | film |
| VOY | Star Trek: Voyager | 1995–2001 | TV |
| FC | Star Trek: First Contact | 1996 | film |
| INS | Star Trek: Insurrection | 1998 | film |
| NEM | Star Trek: Nemesis | 2002 | film |
| ENT | Star Trek: Enterprise | 2001–2005 | TV |
| ST09 | Star Trek (2009) | 2009 | film |
| STID | Star Trek Into Darkness | 2013 | film |
| STB | Star Trek Beyond | 2016 | film |
| DSC/DIS | Star Trek: Discovery | 2017–2024 | TV |
| SHO | Star Trek: Short Treks | 2018–2020 | TV |
| PIC | Star Trek: Picard | 2020–2023 | TV |
| LOW | Star Trek: Lower Decks | 2020–2024 | TV |
| PRO | Star Trek: Prodigy | 2021–present | TV |
| SNW | Star Trek: Strange New Worlds | 2022–present | TV |
| S31 | Star Trek: Section 31 | 2025 | film |
Bajoran characters are listed by family name, which is stated first.
Joined Trills are listed by the name of the symbiont, which replaces the family name.

### A

| Character | Actor | Appearances | Description |
| Leonard James Akaar | Ben Gage | Friday's Child (TOS) | Son of the late Teer Akaar and his widow Eleen on the planet Capella IV. Born 2267 shortly after his father was killed in a Klingon-induced power struggle, he was named after James T. Kirk and Leonard McCoy, who helped to resolve the local conflict. Leonard James Akaar inherited the title of "teer," or chief, of the Ten Tribes of Capella IV. His mother served as regent until the boy came of age to rule. In the novels, Akaar (who was eventually forced to flee Capella with his mother due to another coup) grows up and joins Starfleet; we first see him serving as chief of security on the USS Excelsior under Captain Hikaru Sulu. Later, in the Star Trek: Deep Space Nine relaunch novels, Akaar is a veteran admiral in the fleet. |
| Akorem Laan | Richard Libertini | Accession (DS9) | Bajoran poet best known for The Call of the Prophets. Traveling in a Bajoran lightship, Akorem was the first to find the Celestial Temple (the wormhole to the Gamma Quadrant); when he emerged about 200 years later, Benjamin Sisko gave up his title of Emissary so that Akorem could take it, a decision Sisko regretted when Akorem advocated a return to the D'Jarras (the Bajoran caste system). Sisko and Akorem went to the wormhole together, and the Prophets decided to send Akorem back to his time and reinstate Sisko as their Emissary. |
| Joshua Albert | None (Only discussed, never seen.) | The First Duty (TNG) (mentioned) | Starfleet Academy cadet and friend of Wesley Crusher, a fellow team member with Crusher in Nova Squadron under Nicholas Locarno; Albert died during his squadron's rehearsal of a banned flight maneuver intended to impress the Academy's commencement ceremony attendees. |
| Ves Alkur | Chip Lucia | Man of the People (Star Trek: The Next Generation) | Lumerian ambassador who uses women as "receptacles" for his negative emotions which causes the "receptacles" to die of old age. Deanna Troi almost dies but it is Alkur who receives back the negativity and dies of old age. |
| Various aliens | Bill Blair | Tribunal (DS9) (recurring thereafter) | Various aliens and Starfleet officers played by background actor Bill Blair in 45 episodes of DS9, 2 episodes of VOY and 4 of ENT. |
| Alixus | Gail Strickland | Paradise (DS9) | Leader of a colony that settled on planet Orellius in 2360, responsible for several deaths because she rejected any form of technologically based medicine. |
| Almak | Off-screen voiceover by an unknown performer | Message in a Bottle (VOY) | Romulan subcommander of the IRW T'Met. He leads two other Warbirds to take possession of the USS Prometheus NX-59650, an experimental prototype Federation starship, from its Romulan hijacker, Commander Rekar. However, Almak's fleet opens fire on the Prometheus when he learns that Rekar is no longer in control of it. |
| Aluura | Symba Smith | Profit and Lace (DS9) | A Dabo girl who worked at Quark's in 2374. |
| Kiaphet Amman'sor | None | The Xindi (ENT) (recurring thereafter) | A female aquatic Xindi. She is a member of the Ibix dynasty, and the head aquatic on the Xindi Council. |
| Ancient Humanoid | Salome Jens | The Chase (TNG) | A holographic projection of a member of the race from which Humans, Klingons, Romulans, Cardassians and numerous other Alpha Quadrant species descend |
| Brett Anderson | Terry Serpico | The Vulcan Hello, Battle at the Binary Stars (DSC) | Admiral in Starfleet in command of the fleet during the battle at the binary stars against the Klingons. After ostensibly agreeing on a truce the Klingons ram the Admiral's vessel Europa with a cloaked ship forcing him to initiate the self-destruct sequence destroying the Europa along with the Klingon vessel. |
| Anya | Paddi Edwards | The Dauphin (TNG) | A shapeshifting allasomorph native to the third moon of Daled IV who served as guardian of the planet's leader, Salia, while she was being transported on the Enterprise-D. To the Enterprise crew, Anya assumed the form of an older human woman; her intrinsic appearance is unknown. |
| Apollo | Michael Forest | Who Mourns for Adonais? (TOS) | Extraterrestrial alien believed to be a god by ancient Greeks, who in the 23rd century captures the Enterprise and demands its crew build a society on planet Pollux IV to worship him. |
| Robert T. April | James Doohan (voice) | The Counter-Clock Incident (TAS) | First captain of the USS Enterprise (NCC-1701) during its initial five-year mission. April, later a commodore, was succeeded by Christopher Pike. April appears in a single TAS episode, and in the novels Final Frontier and Best Destiny by Diane Carey as the captain of the Enterprise |
| Sarah April | Nichelle Nichols (voice) | The Counter-Clock Incident (TAS) | Wife of Starfleet officer Robert T. April and chief medical officer of the USS Enterprise (NCC-1701) when her husband was captain. |
| Jonathan Archer | Scott Bakula | Broken Bow (recurring thereafter) (ENT) | Captain of the USS Enterprise (NX-01). |
| Ardra | Marta DuBois | Devil's Due (TNG) | According to the theology of Ventax II, Ardra was a mythic being from the distant past who promised the population a thousand years of prosperity, followed by enslavement upon her return at the end of that epoch. In 2367, a female con artist was unmasked by Enterprise-D personnel after deceiving the Ventaxians into believing she was the deity by using technology to mimic various phenomena believed to herald Ardra's return. |
| Arex | James Doohan (voice) | Beyond the Farthest Star (TAS) (recurring thereafter) | Lieutenant Arex, voiced by James Doohan, was a recurring character on Star Trek: The Animated Series which ran on NBC from 1973 to 1974. The series' writers and artists were able to create his unique alien look because the series was animated; creating such a character with a live-action actor in make-up would not have been feasible. The character was later used in Star Trek novels and comics. Arex was a Starfleet officer assigned to the USS Enterprise as navigator. Arex was a member of a tripedal species (given as "Edosians" in Alan Dean Foster's novelizations of the animated episodes, but as "Triexians" in Peter David's New Frontier series) and had three arms and legs. Arex also sometimes took the conn, but he rarely left the ship on landing party missions due to his bizarre appearance. |
| Argyle | Biff Yeager | Where No One Has Gone Before (TNG) Datalore (TNG) | A chief engineer aboard the Enterprise-D who supervised the engine modifications made by two specialists, also assembled the android Lore with the help of Dr. Beverly Crusher. |
| Armus | Mart McChesney; Ron Gans (voice) | Skin of Evil (TNG) The Spy Humongous (LOW) | Sentient viscous black liquid (the by-product of a procedure in which a race of "titans" shed all their evil and negative attributes) that killed Tasha Yar. |
| Dr. Arridor | Dan Shor | The Price (TNG), False Profits (VOY) | Member of a Ferengi delegation sent to negotiate for the rights to the Barzan wormhole in 2366 who becomes stranded in the Delta Quadrant until his encounter with the starship Voyager. |
| Arturis | Ray Wise | Hope and Fear (VOY) | Alien with exceptional linguistic capability who poses as a friend to Voyager helping them recover a badly garbled transmission from the Alpha Quadrant but uses the opportunity to set up a trap for the entire crew to be assimilated by the Borg |
| Askwith | Rafael Boza | The Forge (ENT) | Starfleet corporal at the United Earth Embassy on Vulcan in 2154. After its bombing, Ambassador Soval performed a mind meld with Askwith and learned that Chief Investigator Stel was responsible for bringing the explosive into the embassy. |
| Jeremy Aster | Gabriel Damon | The Bonding (TNG) | Human civilian, orphaned when his mother, Marla Aster, an officer aboard the USS Enterprise-D was killed in 2366 on an away mission. |
| Marla Aster | Susan Powell | The Bonding (TNG) | Archaeologist aboard the Enterprise-D, and mother of Jeremy Aster. Killed on an away mission in 2366. |
| Mr. Atoz | Ian Wolfe | All Our Yesterdays (TOS) | Librarian and keeper of the Atavachron time-portal device on the planet Sarpeidon. |
| Atul | Dennis Madalone | Visionary (DS9) | Klingon officer and one of three members of a covert strike force conducting surveillance of the Romulan delegation to Starbase Deep Space 9 in 2371. He is the last of his party to be thrown into the brig. |
| Axum | Mark Deakins | Unimatrix Zero (VOY) | Borg drone aboard a vessel in the Beta Quadrant who, while regenerating, due to a recessive gene is able to enter the virtual world of Unimatrix Zero as a free individual and meet with others, including Annika Hansen, like himself. He entertained an intimate relationship with Seven of Nine within Unimatrix Zero until her rescue from the Borg hive by the USS Voyager. Since the Borg Queen is aware of Unimatrix Zero trying to find a way to destroy it for good, Axum contacts Seven of Nine to help them. Axum gets a chance to rekindle their love until Unimatrix Zero is shut down. |
| Ayala | Tarik Ergin | Caretaker, Part I (VOY) (recurring thereafter) | Security officer aboard the USS Voyager and former member of the Maquis |
| Azetbur | Rosanna DeSoto | TUC | Daughter of Klingon Chancellor Gorkon, Azetbur ascended to the chancellorship herself when her father was assassinated in 2293. She is essential for the signing of the Khitomer Accords, the first peace treaty between the Federation and the Klingon Empire. |

### B

| Character | Actor | Appearances | Description |
| B-4 | Brent Spiner | NEM, Remembrance and The Bounty (PIC) | B-4 was first seen in the movie Star Trek: Nemesis. He is a Soong-type android (named after Dr. Noonien Soong, their creator). B-4 is one of three androids built by Dr. Soong before Lore and Data. Praetor Shinzon of Remus was able to obtain the disassembled B-4 and placed some special programming into him, so he could infiltrate the USS Enterprise-E to gain tactical information of the Federation from the ship. B-4 briefly reappears in Star Trek: Picard where it's revealed that he was ultimately disassembled, but Doctors Altan Soong and Bruce Maddox had used the remnants of Data inside of his positronic network to build a new race of androids. Parts of B-4 were later included by Soong in a new android, alongside Data, Lore, and Lal with B-4 briefly speaking through the android. After taking full control of the android, Data said that B-4 was now a part of him. |
| Badar N'D'D | Marc Alaimo | Lonely Among Us (TNG) | Antican delegate to the summit with the Selay on Parliament. (Note: Character name comes from the script.) |
| Bahrat | Carlos Carrasco | Fair Trade (VOY) | Heavy-handed manager of the Nekrit Supply Depot located near the border of the Nekrit Expanse. Bahrat insisted on a 20 percent commission on trades taking place at his station. |
| Lt. Baji | Juliet Cesario | Skin of Evil (TNG) (recurring thereafter) | Female operations/science division officer, who served aboard the Enterprise-D from 2364 to 2365. She was working on the bridge during the rescue mission for Counselor Troi on Vagra II (Skin of Evil), was on duty on the aft section of the bridge when the Enterprise-D took Thadiun Okona aboard and had to handle the differences between Straleb and Atlec (The Outrageous Okona), was working in sickbay when Dr. Pulaski treated Geordi La Forge and told him about surgery to bring back his eyesight (Loud as a Whisper) and was treating several patients in the sickbay following several system malfunctions caused by an Iconian probe (Contagion). (The actress received no credit for her appearances. According to the IMDb, Wikipedia, and Cesario herself this character was named Lt. Baji.) |
| Lyndsay Ballard | Kim Rhodes | Ashes to Ashes (VOY) | Voyager crewmember who died on an away mission in the Delta Quadrant and then was reanimated by the Kobali. |
| Balok | Clint Howard | The Corbomite Maneuver (TOS) | Diminutive alien commander of the First Federation starship Feserius who captures the Enterprise and tests its crew through the use of an intimidating puppet (voiced by Ted Cassidy) |
| Arctus Baran | Richard Lynch | Gambit (TNG) | Captain of a mercenary ship raiding archeological sites for specific artifacts to re-form an ancient Vulcan weapon |
| Barash | Dana Tjowander | Future Imperfect (TNG) | A solitary child from an undetermined species who, desperate for a companion, used an illusory world to entrap William Riker in his specially modified cave on Alpha Onias III. Riker eventually saw through the young alien's illusions and brought Barash back to the Enterprise-D with him. |
| Reginald Barclay | Dwight Schultz | Hollow Pursuits (TNG) (recurring thereafter), FCT, Projections (VOY) (recurring thereafter) | Although he may appear to be nervous and lacking in confidence, Reginald "Reg" Barclay is a highly talented Starfleet systems diagnostic engineer. Stationed aboard the Enterprise-D from 2366, Barclay had a tendency to spend more time inside the holodeck than in real social situations. He also suffered from severe transporter phobia in 2369, although he seems to have overcome this psychological barrier. He also spent time at Jupiter Station as Dr. Lewis Zimmerman's assistant on his EMH project. While stationed aboard the USS Enterprise-E in 2373, and through a strange turn of events involving the Borg, Barclay was able to meet one of his idols, Zefram Cochrane. By 2376, Barclay's main focus was developing a means of communicating with the missing USS Voyager still stranded in the Delta Quadrant. |
| Professor Honey Bare | Terry Farrell | Our Man Bashir (DS9) | Although a holographic character in Julian Bashir's secret agent holosuite program, Professor Bare took on the look of Jadzia Dax during a malfunction. Bare was reputedly Earth's top seismologist in 1964, the year the program was set. |
| Bareil Antos | Philip Anglim | In the Hands of the Prophets (DS9) (recurring thereafter) | Bajoran Vedek who was nominated as possible successor to Kai Opaka, but lost the position to Kai Winn instead. Love interest of Kira Nerys (until his death). |
| Barstow | Richard Derr | The Alternative Factor (TOS) | Starfleet commodore at Starfleet Command who contacts the Enterprise an hour after the disruption/distortion effects emanated from the dead planet the starship is orbiting. Barstow wants to know whether they are natural phenomena or mechanically generated, and, if the latter, by whom and for what purpose. He charges Kirk with finding out the specifics, but cannot assign reserve starships to help the Enterprise because he is evacuating all Starfleet units and personnel within 100 parsecs of her position. |
| Regina Bartholomew | Stephanie Beacham | Ship in a Bottle (TNG) | Holographic love interest of the holographic Professor Moriarty in Data's Sherlock Holmes program |
| Amsha Bashir | Fadwa El Guindi | Doctor Bashir, I Presume? (DS9) | Human female; wife of Richard Bashir, and mother of Julian Bashir. |
| Julian Bashir | Alexander Siddig | Emissary (DS9) (recurring thereafter), Birthright (TNG) | Human male; Chief Medical Officer of Deep Space Nine. |
| Richard Bashir | Brian George | Doctor Bashir, I Presume? (DS9) | Human male; husband of Amsha Bashir, and father of Julian Bashir. In 2348, he took his then 6-year-old son to a planet outside the Federation to have him genetically enhanced. When the fact came out in the open about three decades later, Richard accepted a plea bargain of a 2-year prison sentence to save Julian's career. |
| Marta Batanides | J. C. Brandy | Tapestry (TNG) | Human female; Jean-Luc Picard's Academy classmate. In an alternate timeline created by Q, she and Picard had a romantic relationship. |
| Morgan Bateson | Kelsey Grammer | Cause and Effect (TNG) | Commanding officer of the 23rd century Federation starship USS Bozeman, which became trapped in a temporal causality loop near the Typhon Expanse in 2278. Bateson and his crew emerged in 2368, unaware they had passed through 90 years of time, until Captain Picard of the USS Enterprise-D set them straight. |
| Gabriel Bell | John Lendale Bennett Avery Brooks | Past Tense (DS9) | Human male (April 24, 1987 – September 3, 2024); during a 2024 revolt in San Francisco where federal employees were held hostage, Bell made sure the hostages were not harmed. In the Deep Space Nine episode "Past Tense", he is killed earlier and a time-travelling Benjamin Sisko steps in to fulfill Bell's role in the pivotal historical moment. In a guidebook to Earth that Jake gave to Nog, Gabriel Bell is described as "the father of Earth's post-modern reformism," and shown with a picture of Sisko. |
| Belle | Lindsey Haun | Real Life (VOY) | Holographic female; the Doctor's daughter in his holographic family program, killed after B'Elanna changes the Doctor's program. |
| Benaren | Michael L. Maguire | Before and After (VOY) | Ocampan male; father of Kes, husband of Martis. |
| Ensign Bennett | Tim McCormack | Encounter at Farpoint (TNG) (recurring thereafter) | Ensign Bennett was a Starfleet helmsman aboard the USS Enterprise-D from 2364 to 2370. He was a background character, appearing in a total of 54 episodes, but the actor was never credited. |
| Benzan | Kieran Mulroney | The Outrageous Okona (TNG) | Son of Secretary Kushell from the planet Straleb, entrusting Thadiun Okona with delivering the family's heirloom, the Jewel of Thesia, as a wedding gift to his future wife Yanar of the planet Atlec in 2365. |
| Beta XII-A entity | None | Day of the Dove (TOS) | Non-corporeal alien entity deriving sustenance from violent emotions such as hate and fear in others; attempts to pit Klingons and Enterprise personnel against each other in endless combat |
| B'Etor | Gwynyth Walsh | Redemption (TNG), Firstborn (TNG), Past Prologue (DS9), GEN | Klingon female; one of the Duras sisters. Time magazine rated B'Etor with her sister Lursa, as the 2nd best villain of the Star Trek franchise in 2016. |
| Bill | Leon Russom | TUC | Starfleet admiral who serves as C-in-C in 2293, two months after the Klingon moon Praxis explodes. He tasks Kirk with being the Federation's "olive branch" in escorting the Klingon chancellor, Gorkon, to peace negotiations on Earth. He is addressed in dialogue only as "Bill," but he is credited as "Starfleet Chief in Command." (Noncanon: In the movie novelization, he is called "Rear Admiral William Smillie".) |
| Admiral Black | Gregory Itzin | In a Mirror, Darkly (ENT) | Starfleet admiral in the Mirror Universe killed by Commander Jonathan Archer when not given command of the Defiant |
| Margaret Blackwell | Nancy Vawter | The Pegasus (TNG) | Starfleet vice admiral who ordered the Enterprise-D to rendezvous with the Starship Crazy Horse and pick up Rear Admiral Erik Pressman. She also managed to embarrass Picard somewhat by asking about the nature of the "Captain Picard Day". |
| Bob | Harve Bennett | TFF | Starfleet admiral who, in 2287, tasks Kirk with rescuing the Federation, Klingon and Romulan hostages on Nimbus III. He is addressed in dialogue only as "Bob", but he is credited as "Starfleet Chief of Staff". (Noncanon: In the movie novelization, he is called "Admiral Robert Caflisch". However, the Paramount-Pictures-sanctioned reference text The Star Trek Encyclopedia, by Michael Okuda and Denise Okuda, has retconned the character's name to "Admiral Robert Bennett".) |
| Bochra | John Snyder | The Enemy (TNG) | Romulan centurion and one of two survivors of the crash of the Pi, a small Romulan ship, on the surface of Galorndon Core. Bochra stalks and captures Geordi La Forge, who sarcastically nicknames him "Commodore." However, when the planet's electromagnetic storms wreak havoc with Bochra's metabolism and La Forge's interface with the VISOR, the men put aside their differences and work together to locate and remodulate a neutrino beacon that Wesley Crusher has sent to help locate them. They're soon rescued by the Enterprise-D and Bochra is returned to Commander Tomalak's Warbird. (Continuity Note: Bochra uses the same Romulan salute that Decius first used back in the 1966 TOS episode "Balance of Terror".) |
| Captain Boday | None (Only discussed, never seen.) | First Mention:The Maquis Part I (DS9) (recurring thereafter) | A Gallamite freighter captain frequently mentioned, but never seen, that Jadzia Dax was quite fond of, that Kira Nerys was repulsed by, and that Worf was somewhat jealous of. Mentioned in The Maquis, Let He Who is Without Sin..., Resurrection, Penumbra. |
| Brad Boimler | Jack Quaid | Second Contact (LOW) (recurring thereafter) | Human male Ensign aboard the USS Cerritos. |
| Bok | Frank Corsentino Lee Arenberg | The Battle (TNG) Bloodlines (TNG) | Ferengi DaiMon who tried to wreak vengeance on Picard for the Battle of Maxia. |
| Boothby | Ray Walston | The First Duty (TNG), In the Flesh (VOY), The Fight (VOY) | Groundskeeper of Starfleet Academy and Starfleet Headquarters. In addition to tending grounds, Boothby offered advice and otherwise acted as a mentor to several characters–including Jean-Luc Picard, Kathryn Janeway, and Chakotay–when they were attending Starfleet Academy. Boothby several times gave Janeway a rose. Picard, in whose opinion Boothby "is one of the wisest men he has ever known", calls upon his knowledge of the Nova Squadron cadets while investigating the death of Joshua Albert in "The First Duty." Species 8472 recreates Boothby on a planet designed to mimic Starfleet HQ. 8472-Boothby mimics his signature gesture of offering a rose. Prior to his first on-screen appearance, Boothby is the subject of conversation between Captain Picard and Wesley Crusher in the TNG episodes "Final Mission" and "The Game". |
| Bo'rak | Bob Minor | Visionary (DS9) | Klingon officer and one of three members of a covert strike force conducting surveillance of the Romulan delegation to Starbase Deep Space Nine in 2371. Bo'rak was the drunken Klingon in this episode's teaser. |
| Borg | various actors and actress | Star Trek: The Next Generation (TNG) Star Trek: Voyager (VOY) | Cybernetic organisms linked in a hive mind called "the Collective". The Borg co-opt the technology and knowledge of other alien species to the Collective through the process of "assimilation": forcibly transforming individual beings into "drones" by injecting nanoprobes into their bodies and surgically augmenting them with cybernetic components. The Borg's ultimate goal is "achieving perfection". Their leader is the Borg Queen. |
| Dr. Philip Boyce | John Hoyt | The Cage (TC), The Menagerie (TOS) | Chief medical officer aboard the USS Enterprise in 2254, under the command of Captain Christopher Pike. |
| Leah Brahms | Susan Gibney | Booby Trap (TNG) Galaxy's Child (TNG) | Human female; engineer who developed the warp drive of Galaxy-class starships. During a crisis on board the Enterprise-D, chief engineer Geordi La Forge created a holodeck representation of Brahms, and later used her mission logs to create a personality for the representation. A year later, La Forge met the real Brahms, who found out about the holodeck program La Forge had created and turned hostile. Later, after working with La Forge, she made peace with his indiscretion and they became friends. In the alternate future timeline of "All Good Things...", La Forge is married to someone named "Leah", who may be Brahms (though this is not confirmed). |
| Branch | David Gautreaux | TMP | Starfleet commander of the Epsilon 9 space station, which observes the Klingons' battle with V'ger and then the cloud's direct heading for Earth. When Branch communicates some real-time tactical information to the Enterprise, V'ger reacts negatively to Epsilon 9's sensor scans and destroys the station. |
| Admiral Brand | Jacqueline Brookes | The First Duty (TNG) | Starfleet rear admiral and superintendent of Starfleet Academy in 2368. She presided over the inquiry into the death of Cadet Joshua Albert. |
| Captain Braxton | Allan G. Royal Bruce McGill | Future's End (VOY) Relativity (VOY) | A native of the 29th century, he is the pilot of the Federation timeship Aeon in one timeline, and captain of the Federation timeship USS Relativity in another. In "Future's End" Braxton travels to the 24th century to destroy Voyager, believing it to be the cause of a temporal explosion that will wipe out most of the Solar System in his time. Voyager fights back sending both ships back into the temporal rift leaving Braxton stranded in the 1960s and Voyager in 1996. While investigating the real cause for the temporal explosion in the 29th century, Kathryn Janeway and Chakotay cross paths with an ostensibly manic Braxton whose vessel was stripped by Henry Starling starting the microcomputer revolution. They find out that it was indeed Starling who was responsible for the catastrophe and after preventing it Voyager is sent back into the 24th century by an alternative Braxton. In "Relativity" Braxton recruits Seven of Nine to stop the detonation of an explosive planted on Voyager during its travel through the Delta Quadrant in the 24th century, which is causing a time paradox. |
| Brull | Joey Aresco | The Vengeance Factor (TNG) | Brull was an Acamarian Gatherer who was able to arrange a conference between Sovereign Marouk and Chorgan, the Gatherer's leader, who almost got killed by Marouk's servant Yuta. |
| Brunt | Jeffrey Combs | Family Business (DS9) (recurring thereafter) | Ferengi liquidator, working for the Ferengi Commerce Authority. For a brief period, acting Grand Nagus. He's the one who discovers Ishka's illegal profit-earning activity, and afterwards he does everything to turn Quark's life into a living hell. At one occasion he revokes Quark's business licence for some time. Later though he helps Quark rescue Ishka from the Dominion's captivity. |
| Bu'kaH | Michelle C. Bonilla | Sleeping Dogs (ENT) | Klingon female; engineer on the IKS Somraw in 2151. |
| Michael Burnham | Sonequa Martin-Green | DSC | Human Starfleet mutineer, given temporary war-time field assignment as a science specialist on the USS Discovery. Lead character in Star Trek: Discovery. |
| Eric Burton | Rickey D'Shon Collins | Liaisons (TNG) Masks (TNG) | A student in Ms. Narsu's art class. |

### C

| Character | Actor | Appearances | Description |
| Admiral Cartwright | Brock Peters | TVH, TUC | Starfleet admiral who presides at Starfleet Command in 2286, when the "whale probe/traveler" attacks Earth. In 2293, he conspires with Klingon general Chang and Romulan ambassador Nanclus to derail Federation-Klingon negotiations. |
| Cassie | Penny Johnson | Far Beyond the Stars (DS9) | A waitress, in a 1950s-era diner, who was Benny Russell's girlfriend in a vision experienced by Benjamin Sisko |
| Richard Castillo | Christopher McDonald | Yesterday's Enterprise (TNG) | A Starfleet lieutenant, helmsman aboard the Enterprise-C until it traveled 22 years into the future when he became the effective XO after all other bridge officers were killed, then was endorsed for command by Jean-Luc Picard subsequent to the death of Captain Rachel Garrett. Also, a love interest of an alternate timeline's Tasha Yar. |
| Chakotay | Robert Beltran | Caretaker (VOY) (recurring thereafter) | Starfleet commander and a former Maquis member, best known as the first officer of the starship USS Voyager in the TV series Star Trek: Voyager. (Throughout the series, the special rank insignia designed for former Maquis members indicates that Chakotay is a lieutenant commander, although he is only ever referred to as "commander.") |
| Chandra | Reginald Lal Singh | Court Martial (TOS) | Starfleet captain who served on Captain Kirk's court-martial board. |
| Lt. Chang | Robert Ito | Coming of Age (TNG) | He served as a TAC officer on Relva VII, where he oversaw prospective cadets taking the Starfleet Academy entrance exam in 2364, when Wesley Crusher, Oliana Mirren, the female Vulcan T'Shanik and the Benzite Mordock took their tests. |
| Chaotica | Martin Rayner | Night, Bride of Chaotica!, Shattered (VOY) | Metafiction holodeck character created by Tom Paris for his "Captain Proton" holodeck program. Dr. Chaotica is very fond of "Arachnia, Queen of the Spider People", portrayed by Captain Janeway in the episode "Bride of Chaotica!" (Season 5, episode 12). |
| Christine Chapel | Majel Barrett Jess Bush | The Naked Time (TOS) (recurring thereafter), Beyond the Farthest Star (TAS) (recurring thereafter), TMP, TVH, SNW | Nurse aboard the USS Enterprise (NCC-1701), later a Doctor and Commander. |
| Charlene | Wendy Schaal | Real Life (VOY) | Hologram; the Doctor's wife in his holographic family program. |
| Chef | None (Only discussed, never seen.) | ENT | Chef aboard Jonathan Archer's Enterprise-NX01. |
| Admiral Chekote | Bruce Gray | The Circle (DS9), Gambit, Part I (TNG) | A Starfleet admiral conferred with (separately) by both Commander Sisko and Commander Riker. |
| Pavel Chekov | Walter Koenig Anton Yelchin | TOS, TMP, WOK, SFS, TVH, TFF, TUC, GEN, ST09, STID, STB | Starfleet officer who served aboard the USS Enterprise (NCC-1701), USS Enterprise (NCC-1701-A) and USS Reliant. |
| Chorgan | Stephen Lee | The Vengeance Factor (TNG) | Chorgan was the leader of the Acamarian Gatherers and a member of the Lornak clan. In 2366, Chorgan and the Acamarian Sovereign Marouk successfully negotiated an accord, after Marouk's servant Yuta attempted to kill Chorgan because of ancient clan rivalries. |
| Ch'Pok | Ron Canada | Rules of Engagement (DS9) | Klingon advocate who argued at an extradition hearing on Deep Space Nine to have Worf sent to Qo'noS for trial after he apparently destroyed a Klingon civilian ship, killing all 441 of its passengers. |
| John Christopher | Roger Perry | Tomorrow Is Yesterday (TOS) | 1960-era U.S. Air Force captain who was brought aboard the Enterprise after his fighter jet was unintentionally crushed by a tractor beam |
| Ensign Clancy | Anne Elizabeth Ramsay | The Emissary (TNG) | Female Starfleet ensign and flight controller aboard the Enterprise-D in 2365. |
| L. Q. "Sonny" Clemmons | Leon Rippy | The Neutral Zone (TNG) | Human male; 20th century civilian cryogenically frozen and discovered by the USS Enterprise-D. Most famous for his line: "Why don't you come back later on and you and me will find us a couple o' low mileage 'pit woofies' and help 'em build a memory." |
| Zefram Cochrane | Glenn Corbett James Cromwell | Metamorphosis (TOS), FCT, Broken Bow (ENT) (recurring thereafter) | Human male; Earth's inventor of warp drive and the first human to make first contact with Vulcans. |
| J.M. Colt | Laurel Goodwin Nicole Dickinson | The Cage (TC), Such Sweet Sorrow (DSC) | Yeoman aboard Captain Christopher Pike's Enterprise |
| The Comic (Ronald B. Moore) | Joe Piscopo | The Outrageous Okona (TNG) | Holodeck Comedian (designated program list code RW-96321) performing at the holodeck recreation of Charnock's Comedy Cabaret. The program was run by Data, who wanted to learn from "Mr. Comic" what would be funny. (The character was identified by the holodeck program list as "Ronald B. Moore," a reference to visual effects coordinator Ronald B. Moore, who was one of the people who assembled the holodeck computer graphic.) |
| Computer voice | Majel Barrett | Mudd's Women (TOS) (recurring thereafter), The Lorelei Signal (TAS) (recurring thereafter), 11001001 (TNG) (recurring thereafter), Emissary (DS9) (recurring thereafter), GEN, Caretaker (VOY) (recurring thereafter), FCT, INS, NEM, In a Mirror, Darkly, Part II, These are the Voyages... (ENT), ST09 | Majel Barrett was the only performer to have had a role on the first six Star Trek series, usually as the voice of the various computers used throughout the series and five of the Star Trek films, from TOS Enterprise to the Enterprise-D, Defiant and Voyager, plus numerous Starship and Runabout computers, most likely giving her the most voice appearances in all of Trek. |
| Katrina Cornwell | Jayne Brook | DSC | Starfleet Admiral, recurring character in Star Trek: Discovery. |
| Kimara Cretak | Megan Cole Adrienne Barbeau | Image in the Sand, Shadows and Symbols, Inter Arma Enim Silent Leges (DS9) | Being a Romulan Senator, she was a representative of the Romulan empire for a short time aboard Deep Space Nine. She was set up by Section 31 to be accused of treason against the empire and imprisoned. |
| Beverly Crusher | Gates McFadden | Encounter at Farpoint (TNG) (recurring thereafter), GEN, FCT, INS, NEM | Chief Medical Officer aboard the USS Enterprise (NCC-1701-D) and USS Enterprise (NCC-1701-E); widow of Jack Crusher and mother of Wesley Crusher. |
| Jack R. Crusher | Doug Wert | Family (TNG), Violations (TNG), Journey's End (TNG) | Deceased Starfleet officer, husband of Beverly Crusher and father of Wesley Crusher. He served aboard the USS Stargazer under Captain Picard, his friend, but died sometime during its mission. In "Family", when Dr. Crusher retrieved some of his things from storage, the label on the travel case lists him as "lieutenant commander", although the rank insignia on his old uniform indicates otherwise (lieutenant junior grade). Jack Crusher recorded a video message to his son Wesley during his infancy, to be viewed when he was older. Jack intended this to begin a series of pre-recorded video messages to Wesley, but because of his death, he only ever got to make one message. |
| Jack Crusher | Ed Speleers | Star Trek: Picard (season 3) | Son of son of Admirals Beverly Crusher and Jean-Luc Picard conceived in the 2380s. To save her son from Picard's enemies, Beverly severed ties with her former friends and crewmates of the USS Enterprise and decided to raise Jack by herself. In 2401, their medical charity ship (SS Eleos) is attacked several times by different factions. Beverly sends a distress call to Picard who after seeing her realizes that Jack is his son. Jack is saved by the bounty hunter Vadic who turns out to be a Changeling working for the Borg Queen to turn him into the Borg drone Võx. Jack inherited some Borg biological components in his DNA hidden in his father's cortex that made all Starfleet crew members under 25 susceptible for assimilation by the Borg Queen. Jack arrived at her location, was captured, and assimilated under her supervision. After Picard linked with his son, he was able to reach Jack inside of Võx and Jack rejected his Borg identity. Crusher is later placed in an accelerated program and within a year is commissioned with the rank of ensign, serving as the special counselor to Captain Seven of Nine on the USS Enterprise-G where he is approached by Q who reveals that the trial of Humanity has only just begun for Jack. |
| Wesley Crusher | Wil Wheaton | Encounter at Farpoint (TNG) (recurring thereafter), NEM | Enterprise-D civilian (crew family member), then Starfleet Academy cadet; son of Jack Crusher and Enterprise-D's chief medical officer Beverly Crusher. |
| Crystalline Entity | None | Datalore (TNG), Silicon Avatar (TNG) | Life form that destroyed colonies on Omicron Theta and other planets. Conspired with Lore in attempt to destroy life on the Enterprise-D. Destroyed by the mother of one of its victims. |
| Jal Culluh | Anthony De Longis | Basics Part II (VOY), State of Flux (VOY) | First Maje, or leader, of the Kazon-Nistrim, one of the various warring sects of the Kazon race who inhabit the farthest region of the Delta Quadrant on the other side of the Milky Way Galaxy. |

### D

| Character | Actor | Appearances | Description |
| Jenna D'Sora | Michele Scarabelli | In Theory (TNG) | Starfleet lieutenant (j.g.) and Enterprise-D security officer who fell in love with Data. |
| Dahj | Isa Briones | Remembrance (PIC) | Daughter of Data, killed by Romulan assassins. |
| Damar | Casey Biggs | Return to Grace (DS9) (recurring thereafter) | Cardassian military officer first serving under Gul Dukat then puppet head of the Cardassian Union within the Dominion and finally rebel leader for Cardassian freedom from the Dominion. |
| Dammar | Kenneth Tigar | Displaced (VOY) | Chief operative of the Nyrians; translocated the Voyager crew and took command of the ship. |
| Damron | Jeffrey Dean Morgan | Carpenter Street (ENT) | Xindi Reptilian scientist. |
| Caithlin Dar | Cynthia Gouw | TFF | Romulan Ambassador to the Planet of Galactic Peace. |
| Dara | Michelle Forbes | Half a Life (TNG) | Daughter of Kaelon II's Dr. Timicin |
| Darhe'el | Harris Yulin | Duet (DS9) | Cardassian Gul and leader of the Gallitep labor camp on Bajor during the Cardassian Occupation. He was dubbed the "Butcher of Gallitep" because of all the atrocities committed there under his command. Never directly appears, only impersonated by filing clerk Aamin Marritza in his hope of being sentenced to death by a Bajoran court and executed. |
| Arne Darvin | Charlie Brill | The Trouble with Tribbles (TOS), Trials and Tribble-ations (DS9) | In "The Trouble with Tribbles", Darvin is a Klingon who poses as a Federation official to sabotage Federation attempts to colonize Sherman's Planet. A tribble, sensitive to Klingons, hints at his true identity, which is confirmed by Dr. Leonard McCoy. Darvin is arrested. According to dialog in "Trials and Tribble-ations", Klingon intelligence subsequently turned its back on Darvin, who spent the next 100 years posing as a human merchant going by the name "Barry Waddle". Brill reprised the role for "Trials and Tribble-ations", in which Darvin gains passage from Cardassia to Bajor aboard the USS Defiant. Darvin uses the Bajoran Orb of Time to send the ship back to the time and place depicted in "The Trouble with Tribbles". Intent on exacting revenge on James T. Kirk, he plants a bomb in a tribble; the Defiant's crew prevents Kirk's murder and captures Darvin. |
| Data | Brent Spiner | Encounter at Farpoint (TNG) (recurring thereafter), GEN, FCT, INS, NEM, PIC | Android – second officer of the Enterprise-D. |
| Dathon | Paul Winfield | Darmok (TNG) | Tamarian captain, the first of his race to successfully establish communications between his species and the Federation. |
| Carmen Davila | Susan Diol | Silicon Avatar (TNG) | Senior member of the Malona IV project, died when the Crystalline Entity attacked the colony. |
| Dax (symbiont) | None | Invasive Procedures (DS9) | Trill symbiont, over 300 years old in the 24th century and carried by the 8th (later 9th) host. Only appears through the hosts who carry it (and briefly through SFX). |
| Audrid Dax | Armin Shimerman | Facets (DS9) | Joined Trill; fourth host of Dax symbiont. (Never appears directly but inhabits Quark's body.) |
| Curzon Dax | Frank Owen Smith René Auberjonois | Emissary (DS9), Facets (DS9) | Trill male; seventh host of Dax symbiont before Jadzia, as well as her mentor. (In addition to flashbacks, he at one point inhabits Odo's body.) |
| Emony Dax | Chase Masterson | Facets (DS9) | Joined Trill female; third host of Dax symbiont. (Never appears directly but inhabits Leeta's body.) |
| Ezri Dax | Nicole de Boer | Image in the Sand (DS9) (recurring thereafter) (season 7) | Joined Trill female; ninth host of Dax symbiont; Starfleet officer, and counselor aboard DS9. Formerly Ezri Tigan. |
| Jadzia Dax | Terry Farrell | Emissary (DS9) (recurring thereafter) (seasons 1–6) | Joined Trill female; eighth host of Dax symbiont; Starfleet officer, and science officer aboard DS9 from 2371 to 2374. |
| Joran Dax | Jeff Magnus McBride Leigh J. McCloskey Avery Brooks | Equilibrium (DS9), Facets (DS9), Field of Fire (DS9) | Joined Trill male; sixth host of Dax symbiont. Formerly Joran Belar, an unstable murderer. (In addition to appearing in flashbacks, he at one point inhabits the body of Commander Sisko.) |
| Lela Dax | Nana Visitor | Facets (DS9) | Joined Trill female; first host of Dax symbiont. (Never appears directly but inhabits the body of Major Kira.) |
| Tobin Dax | Colm Meaney | Facets (DS9) | Joined Trill male; second host of Dax symbiont. (Never appears directly but inhabits the body of Chief O'Brien.) |
| Torias Dax | Alexander Siddig | Facets (DS9) | Joined Trill male; fifth host of Dax symbiont. (Never appears directly but inhabits the body of Dr. Bashir.) |
| Verad Dax | John Glover | Invasive procedures (DS9) | Verad Kalon was an unjoined Trill and failed host candidate who briefly stole the Dax symbiont from Jadzia Dax in 2370. |
| Yedrin Dax | Gary Frank | Children of Time (DS9) | Trill; descendant of Jadzia Dax and host of the Dax symbiont in an alternate timeline. |
| Richard Daystrom | William Marshall | The Ultimate Computer (TOS) | Human male; creator of M-5 multitronic computer system. Also created the Enterprise's main computer. 200 years later, the Federation's research and development facility the Daystrom Institute was named after him. |
| Debin | Douglas Rowe | The Outrageous Okona (TNG) | Chief Representative of the Atlec legation in 2365, who was chasing after The Outrageous Okona, believing that Okona had impregnated Debin's only daughter Yanar. |
| Decius | Lawrence Montaigne | Balance of Terror (TOS) | A proud young Romulan officer who served aboard the Praetor's flagship Bird-of-Prey in 2266. He dispatched a coded message to the Praetor while the ship was under cloak, thereby breaking the "rule of silence." For this infraction, he was reduced two steps in rank. Later, he was ordered to place a nuclear warhead with a proximity fuse among the debris that was to be jettisoned from the ship. This maneuver succeeded in severely damaging the Enterprise. Decius was viewed by the ship's elder Centurion as having powerful friends who may not appreciate his being demoted, and which could mean danger for the ship's Commander. |
| Matt Decker | William Windom | Doomsday Machine (TOS) | Starfleet commodore and commanding officer of the starship USS Constellation until its crew were killed by an extraterrestrial-created "planet eater" Ultimate Weapon. Decker tried to kill the planet 'eater' by going on a suicide mission with one of the shuttles belonging to the USS Enterprise. He failed, but analysis of his attempt provided inspiration for the final solution used to defeat the machine. |
| Willard Decker | Stephen Collins | TMP | Captain of the USS Enterprise before joining with V'ger, son of Commodore Matt Decker. Decker's basic character outline was originally developed as part of Star Trek: Phase II before that project became The Motion Picture. Some of this character's elements are similar to those of William Riker, the second in command of the USS Enterprise-D in Star Trek: The Next Generation. |
| Degra | Randy Oglesby | The Xindi (ENT) (recurring thereafter) | Primate representative on the Xindi Council; scientist who supervised construction of the Xindi superweapon. |
| DeSalle | Michael Barrier | The Squire of Gothos (TOS), This Side of Paradise (TOS), Catspaw (TOS) | Starfleet lieutenant of French descent. DeSalle served as the Enterprise's navigator ("The Squire of Gothos"), botanist ("This Side of Paradise"), and assistant chief engineer ("Catspaw"). In "The Squire of Gothos", DeSalle is part of the landing party that encounters Trelane. In "This Side of Paradise", DeSalle discovers that the colonists on Omicron Ceti III are the only life forms to survive exposure to the planet's Berthold rays. He also performs a quantitative analysis of the crops being grown by the colonists. In "Catspaw", DeSalle commands the Enterprise while Captain Kirk, Commander Spock and Lieutenant Commander Scott are being held prisoner on the surface of Pyris VII. He directs the crew's effort to pierce an alien force field to rescue the landing party. (Conjecture: The Star Trek Concordance, by Bjo Trimble, lists his first name as "Vincent".) |
| Stefan DeSeve | Barry Lynch | Face of the Enemy (TNG) | Former Starfleet ensign who defected to Romulus. He returns to the Federation after becoming disillusioned with the Romulans. He also relays a message from Ambassador Spock that the Enterprise-D must rendezvous with a Corvallen freighter, which is supposed to be carrying Romulan vice proconsul M'ret and his two top aides, who are defecting to the Federation. |
| Dickerson | Arell Blanton | The Savage Curtain (TOS) | Security guard; led honor guard detachment to greet the Excalbian projection of President Lincoln. |
| Dikironium Cloud Creature | None | Obsession (TOS) | Sentient gaseous cloud creature that feeds off iron-based hemoglobin; once decimated the crew of the starship Farragut then years later is encountered by the Enterprise |
| The Doctor | Robert Picardo | Caretaker (VOY) (recurring thereafter), FCT, Doctor Bashir, I Presume? (DS9) | "The Doctor" was the name given by the crew of the USS Voyager to their Emergency Medical Hologram (alternatively abbreviated as "EMH" or "EMH Mark I") who also served as Chief Medical Officer of the ship in lack of a flesh-and-blood doctor. In FCT Another EHM Mark I had a brief appearance when Dr. Beverly Crusher called him in order to stall The Borg. |
| Klim Dokachin | Graham Jarvis | Unification (TNG) | Zakdorn; quartermaster and administrator of the Federation Surplus Depot Z15. |
| Guruk Dolim | Scott MacDonald | The Xindi (ENT) (recurring thereafter) | Reptilian regimental commander and representative on the Xindi Council. He hijacked the Xindi superweapon. |
| Jose Dominguez | None (Only mentioned, never seen.) | The Man Trap (TOS) | Starfleet officer and "space commander" of the starship base on Corinth IV. He requests information regarding the Enterprise's delay at Planet M-113; he says the starship has "supplies he urgently needs". |
| Donatra | Dina Meyer | NEM | Romulan commander of the IRW Valdore. She attempts to ingratiate herself to Praetor Shinzon by flirting with him, but he prefers that she demonstrate her allegiance by watching Commander Suran, whose impatience and lack of respect have given Shinzon pause. Donatra fears that a war with the Federation will mark Romulan children for generations to come. She eventually rejects Shinzon and fights with the Enterprise-E against the Reman Warbird Scimitar. Although the Valdore is severely damaged in battle, Donatra is able to offer aid to the ram-damaged Enterprise after the Scimitar is destroyed. |
| Admiral Dougherty | Anthony Zerbe | INS | A Starfleet admiral working with the Son'a with designs on the Briar Patch |
| Sarina Douglas | Faith Salie | Statistical Probabilities, Chrysalis (DS9) | Human female whose genetic engineering went wrong and caused her to be cataleptic for several years. Later cured by Dr. Julian Bashir and briefly got romantically involved with him. |
| Drea | Lezlie Dalton | By Any Other Name (TOS) | Female Kelvan who pilots the Enterprise through the Galactic Barrier on its way to the Andromeda Galaxy. |
| Duchamps | Michael Dorn | Our Man Bashir (DS9) | An assistant to Dr. Hippocrates Noah in Julian Bashir's secret agent program. Due to a transporter malfunction, Duchamp appeared as Worf. |
| Skrain Dukat | Marc Alaimo | Emissary (DS9) (recurring thereafter) | Cardassian Gul. Prefect of Bajor during the Cardassian Occupation; Commander of Terok Nor. Father of Tora Ziyal. Briefly a guerilla fighter against the Klingon Empire, afterwards head of the Cardassian Union under The Dominion until Ziyal's death. Later he acts as the "anti-emissary" of the pagh-wraiths. |
| Duras, son of Ja'rod | Patrick Massett | Sins of the Father, Reunion (TNG) The Mind's Eye (mentioned only)(TNG) | Klingon male. The House of Duras was a notably aggressive and dishonest dynasty of the Klingon Empire. His father was a traitor who betrayed the Khitomer colony to the Romulans. When Ja'rod's treason was discovered post-mortem, High Council-member Duras had the blame placed on Worf's father, Mogh. His House included his two sisters, Lursa and B'Etor, and his illegitimate son, Toral. To spare his brother Kurn and to prevent the Klingon Empire from falling into civil war, Worf accepts discommendation, but calls Duras the son of a traitor and backhands him across the face, a warning that Worf will kill Duras. After Kim'pec dies of poison, Duras tries to become Kim'pec's successor on the Klingon High Council; when Worf's mate K'Ehleyr discovers the truth about the Duras family's treason, Duras kills her. In a duel Worf kills Duras, an event the Klingon High Council approved of. |
| Duras, son of Toral | Daniel Riordan | Judgment (ENT), Bounty (ENT), The Expanse (ENT) | Klingon male, sent to apprehend Jonathan Archer and destroy the Enterprise. |

### E

| Character | Actor | Appearances | Description |
| Amelia Earhart | Sharon Lawrence | The 37s (VOY) | Human female; abducted from Earth in 1937; found cryogenically frozen in the Delta Quadrant by the Voyager crew. |
| Julius Eaton | Alexander Siddig | Far Beyond the Stars (DS9) | A writer for a 1950s era science fiction magazine in a vision experienced by Benjamin Sisko |
| Kay Eaton | Nana Visitor | Far Beyond the Stars (DS9) | A writer (who used the pseudonym "K.C. Hunter") for a 1950s-era science fiction magazine in a vision experienced by Benjamin Sisko |
| Michael Eddington | Kenneth Marshall | The Search (DS9) Our Man Bashir For The Cause (DS9) For The Uniform Blaze of Glory | Starfleet lieutenant commander and chief of Starfleet security on Starbase Deep Space 9, beginning in late 2370. He later defected to join the Maquis. Under Eddington the Maquis not only managed to drive Cardassians away from two planets so they could become human colonies but were on the verge of declaring themselves an Indepdendant Nation before he was captured by Benjamin Sisko. In his last appearance, Eddington sacrifices himself so that last five surviving members of the Maquis can be led to safety by Benjamin Sisko (Whom Eddington tricked into helping him) |
| Ee'Char | Craig Wasson | Hard Time (DS9) | Male; Miles O'Brien's simulated cellmate during his time-compressed simulation of incarceration. Afterwards he returns as a hallucination to haunt O'Brien (who killed him). |
| Albert Einstein | Jim Norton | The Nth Degree (TNG), Descent, Part I (TNG) | Holographic reproduction for a game of poker with Commander Data. |
| Ekoria | Ellen Wheeler | The Quickening (DS9) | Teplan female; afflicted by the blight, the first one to believe that Julian Bashir could find a cure to her condition. She died from the blight, but her baby was born perfectly healthy. |
| Elaan | France Nuyen | Elaan of Troyius (TOS) | Dohlman of Elas. Her planet's Council of Nobles offered her in marriage to the ruler of Troyius, a neighboring planet in the Tellun Star System, to prevent the escalation of hostilities between the two worlds. En route to Troyius on the Enterprise, Elaan stabs Ambassador Petri of Troyius for being in her quarters without permission. Later, when Elaan sheds tears (which act as a "super love potion") because she feels that nobody likes her, Kirk wipes them away and immediately becomes biochemically attracted to her. However, he's able to shake off the effects while in combat with the Klingons. In accordance with his duty, Kirk delivers Elaan to Troyius to be married, although neither is happy at the prospect. |
| Tam Elbrun | Harry Groener | Tin Man (TNG) | Betazoid male; had unusually great telepathic ability skilled at making contact with non-humanoid sentient life forms. |
| Elnor | Evan Evagora | PIC | Romulan male; an orphan raised by warrior nuns on Vashti, Qalankhkai to Picard. |
| Endar | Sherman Howard | Suddenly Human (TNG) | Talarian captain of the Q'Maire whose biological son was killed by humans. In accordance with Talarian customs, he claimed the human boy Jeremiah Rossa as his own son, renaming him Jono. Years later, when Captain Jean-Luc Picard intended to return Jono to his human family, Endar was ready to go to war to retrieve his adopted son. |
| Enright | James Doohan (voice) | The Ultimate Computer (TOS) | Starfleet commodore on the Watchtower-class space station that serves as headquarters for the M-5 multitronic unit war games. |
| Eris | Molly Hagan | The Jem'Hadar (DS9) | A female Vorta pretending to be a fellow prisoner when Benjamin Sisko and Quark are taken captive by the Jem'Hadar. |
| Esoqq | Reiner Schöne | Allegiance (TNG) | A native of the planet Chalnoth, among those held captive (including Captain Picard) in an alien prison/laboratory |
| Gul Evek | Richard Poe | Journey's End, Preemptive Strike (TNG), Playing God, The Maquis, Tribunal (DS9), Caretaker (VOY) | Cardassian gul and commander of the Vetar. A confrontational opponent, appearing in three Star Trek series. |

### F

| Character | Actor | Appearances | Description |
| Kivas Fajo | Saul Rubinek | The Most Toys (TNG) | Zibalian male; kidnapped Data for his collection of priceless artifacts. |
| Falcon | Mark Yerkes Colm Meaney | Our Man Bashir (DS9) | Hologram; assassin in Julian Bashir's secret agent holo-program. Due to a transporter malfunction, Falcon's physical parameters were temporarily modeled on O'Brien. |
| Dr. Farek | Ethan Phillips | Ménage à Troi (TNG) | Ferengi male; crewmember of the Krayton, tried using a mind probe on Lwaxana Troi to learn the secret of Betazed telepathy. |
| John Farrell | Jim Goodwin | The Enemy Within (TOS), Mudd's Women (TOS), Miri (TOS) | Human male; he served as navigator in TOS: "The Enemy Within" and "Mudd's Women" and as the relief communications officer in TOS: "Miri". |
| Karen Farris | Courtney Peldon | Valiant (DS9) | Human female; Red Squad cadet appointed First Officer of the USS Valiant after the death of Captain Ramirez. |
| Ensign Felton | Sheila Franklin | A Matter of Time, New Ground, Hero Worship, The Masterpiece Society, Imaginary Friend (all TNG) | Human female ensign who served as the conn officer on the Enterprise-D (numerous season 5 episodes, on-screen credit for five talking episodes) |
| Female Changeling | Salome Jens | The Search (DS9) (recurring thereafter) | Nameless ("What use would I have for a name?", DS9 episode Behind the Lines) Changeling and Founder who helps lead the Dominion's invasion of the Alpha Quadrant while teaching the Shapeshifters' ways to Odo in an attempt to lure him back to The Great Link. |
| Kyril Finn | Richard Cox | The High Ground (TNG) | Terrorist leader on planet Rutia IV who kidnaps Dr. Beverly Crusher to treat his people who are suffering from side-effects of the dimensional-shift transporter they use |
| Marla E. Finn | Nora Leonhardt | Eye of the Beholder (TNG) | Starfleet ensign assigned to Utopia Planetia shipyards. She was killed by ex-lover Lieutenant Walter Pierce. |
| Finnegan | Bruce Mars | Shore Leave (TOS) | Starfleet Academy cadet, upperclassman, prankster, and merciless tormentor to a young fellow cadet named James T. Kirk |
| Fitzgerald | Richard Derr | The Mark of Gideon (TOS) | Starfleet admiral who refuses to give Spock permission to violate the planet Gideon's sovereignty and beam down to locate the missing and allegedly kidnapped Captain Kirk, since Spock cannot prove to him that Kirk's life is in danger. |
| Fitzpatrick | Ed Reimers | The Trouble with Tribbles (TOS) | Starfleet admiral who ordered Kirk to cooperate fully with Nilz Baris regarding security protection for the quadrotriticale on Deep Space Station K-7. |
| Flint | James Daly | Requiem for Methuselah (TOS) | Human male; a 6000-year-old immortal, encountered on the planet Holberg 917G. Flint lived as many influential persons in Earth history. |
| Vic Fontaine | James Darren | His Way (DS9) (recurring thereafter) | Hologram; a holodeck entertainer, used as a counselor by various crewmembers of Deep Space Nine. |
| Fujisaki | None (Only discussed, never seen.) | Inter Arma Enim Silent Leges (DS9) | Starfleet vice admiral and deputy chief of Starfleet Intelligence until 2374, when he died. Section 31 believed that Koval, the Romulan chairman of the Tal Shiar, was involved in his death, but there was no proof. (Never appears, only talked about.) |