# List of Star Trek characters (N–S)

This is a list of characters from the Star Trek franchise and the media in which they appear. It lists both major and minor fictional characters including those not originally created for Star Trek but featured in it, alongside real-life persons appearing in a fictional manner, such as holodeck recreations.

## 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.

### N

| Character | Actor | Appearances | Description |
| Nakahn | Stephen Davies | Darkling (VOY) | Mikhal Traveler and owner of a lodge. |
| Admiral Nakamura | Clyde Kusatsu | The Measure of a Man, Phantasms, All Good Things... (TNG) | A Starfleet Admiral. |
| Nanclus | Darryl Henriques | TUC | Romulan ambassador to the Federation in 2293. Involved in the assassination of Klingon Chancellor Gorkon. |
| Mrs. Narsu | | Masks (TNG) | A teacher who supervised Eric Burton's art class. |
| Alynna Nechayev | Natalija Nogulich | Chain of Command, Part I (TNG) (recurring thereafter); The Maquis, Part II (DS9) (recurring thereafter) | Starfleet Admiral involved in negotiations over the Cardassian Demilitarized Zone. A simulated version of the Admiral was used by the Dominion to test the reaction of Sisko and Starfleet in general to a Dominion attempt to gain a foothold in the Alpha Quadrant. |
| Neela | Robin Christopher | Duet (DS9), In the Hands of the Prophets (DS9) | Bajoran engineer aboard Deep Space Nine; secretly working for Winn Adami. |
| Neelix | Ethan Phillips | Caretaker (VOY) (recurring thereafter) | Talaxian ship's cook, morale officer, and chief ambassador of the USS Voyager. |
| Crewman Nelson | Rachen Assapiomonwait | The Schizoid Man (TNG) (recurring thereafter) | Engineer on the USS Enterprise-D during the 2360s; recurring uncredited background character. |
| Nero | Eric Bana | ST09 | Romulan captain of the 24th-century mining vessel Narada; transported through time on his quest for vengeance for the destruction of his home planet. |
| Nevala | Valerie Wildman | Message in a Bottle (VOY) | Romulan officer involved in hijacking the USS Prometheus NX-59650, an experimental prototype Federation starship. |
| Isaac Newton | John Neville Peter Dennis | Descent, Part 1 (TNG), Death Wish (VOY) | Famous Earth physicist, recreated in the holodeck for a game of poker with Data. Also summoned by "Q" to the USS Voyager to testify at Quinn's asylum hearing. |
| Nidell | Salli Richardson-Whitfield | Second Sight (DS9) | Halanan wife of terraformer Gideon Seyetik. By "psychoprojective telepathy", she creates an alter ego, Fenna, who fell in love with Benjamin Sisko. |
| Nilva | Henry Gibson | Profit and Lace (DS9) | Slug-O-Cola tycoon and commissioner of the Ferengi Commerce Authority. |
| Dr. Noah | Avery Brooks | Our Man Bashir (DS9) | A mad scientist in Bashir's secret agent program. Temporarily altered by a transporter malfunction to look like Benjamin Sisko. |
| Helen Noel | Marianna Hill | Dagger of the Mind (TOS) | A medical officer on the Enterprise, specializing in psychiatry and penology. |
| Nog | Aron Eisenberg | Emissary (DS9) (recurring thereafter) | Son of Rom and nephew of Quark; first Ferengi in Starfleet |
| Noggra | Robert DoQui | Sons of Mogh (DS9) | Old family friend of Worf who takes Kurn into his family. |
| Heihachiro Nogura | None | TMP (mentioned), books | Starfleet Commanding Admiral and old friend of the Kirk family. |
| Nomad | Vic Perrin (voice) | The Changeling (TOS) | Hybrid of an Earth space probe and an alien probe. Driven to sterilize imperfection. |
| Norman | Richard Tatro | I, Mudd (TOS) | An android who infiltrates and hijacks the Enterprise. |
| Noss | Lori Petty | Gravity (VOY) | Survives on a Class D planet for several years. Falls in love with Tuvok. |
| N'Vek | Scott MacDonald | Face of the Enemy (TNG) | Romulan subcommander of the IRW Khazara and a member of Ambassador Spock's underground movement on Romulus. |

### O

| Character | Actor | Appearances | Description |
| Keiko Ishikawa O'Brien | Rosalind Chao | Data's Day (TNG) (recurring thereafter); A Man Alone (DS9) (recurring thereafter) | Star Fleet botanist; school teacher on Deep Space Nine; wife of Miles O'Brien and mother to Molly and Kirayoshi O'Brien. |
| Kirayoshi O'Brien | Clara Bravo | The Begotten (DS9) (recurring thereafter) | Son of Keiko and Miles O'Brien; carried to term by Kira Nerys after Keiko is critically injured, in a plotline developed to explain actress Nana Visitor's real-life pregnancy. |
| Miles Edward O'Brien | Colm Meaney | Encounter at Farpoint (TNG) (recurring thereafter); Emissary (DS9) (recurring thereafter) | Transporter chief on the Enterprise-D, Chief of Operations at DS9, professor of engineering at Starfleet Academy; husband of Keiko O'Brien and father to Molly and Kirayoshi O'Brien. |
| Molly O'Brien | Hana Hatae, Michelle Krusiec | Disaster (TNG) (recurring thereafter); A Man Alone (DS9) (recurring thereafter) | Daughter of Keiko and Miles O'Brien. |
| Katie O'Claire | Kate Mulgrew | Fair Haven (VOY) | Alias used by Kathryn Janeway while in Fair Haven. |
| Odala | Concetta Tomei | Distant Origin (VOY) | Saurian minister. |
| Odan | Franc Luz | The Host (TNG) | Trill mediator. |
| Odo | René Auberjonois | Emissary (DS9) (recurring thereafter) | Changeling Security Officer on Deep Space Nine. |
| Odona | Sharon Acker | The Mark of Gideon (TOS) | Daughter of Ambassador Hodin of the planet Gideon. |
| Ralph Offenhouse | Peter Mark Richman | The Neutral Zone (TNG) | 20th-century human cryogenically frozen and discovered by the Enterprise-D. |
| Alyssa Ogawa | Patti Yasutake | Future Imperfect (TNG) (recurring thereafter), GEN | Nurse aboard the Enterprise-D and -E. |
| Thadiun Okona | William O. Campbell | The Outrageous Okona (TNG), PRO | Alien captain of the small Class 9 interplanetary cargo carrier Erstwhile. |
| Omet'iklan | Clarence Williams III | To the Death (DS9) | Jem'Hadar "First"; cooperates with Sisko on a mission to deal with renegade Jem'Hadar soldiers. |
| Onaya | Meg Foster | The Muse (DS9) | Vampiric being who feeds on creative energy. Claims to have helped artists throughout the quadrant, including Earth's William Butler Yeats. |
| Kai Opaka | Camille Saviola | Emissary (DS9) (recurring thereafter) | Kai (spiritual leader) of Bajor through the latter years of the Cardassian occupation. |
| Operations Division / Security Officer | Dexter Clay | Encounter at Farpoint (TNG) (recurring thereafter) | Junior-grade Lieutenant on the Enterprise-D. |
| Orta | Jeffrey Hayenga | Ensign Ro (TNG) | Bajoran terrorist framed by the Cardassians for an attack against a Federation colony. |

### P

| Character | Actor | Appearances | Description |
| Palmer | Elizabeth Rogers | The Doomsday Machine (TOS), The Way to Eden (TOS) | Relief communications officer. |
| Douglas Pabst | René Auberjonois | Far Beyond the Stars (DS9) | Editor of a 1950s-era science fiction magazine in a vision experienced by Benjamin Sisko. |
| Pardek | Malachi Throne | Unification (TNG) | Romulan senator for the Krocton Segment. Involved in negotiations with Ambassador Spock about Vulcan-Romulan reunification. |
| Parem | Brian Cousins | The Next Phase (TNG) | Romulan officer who, along with Geordi La Forge and Ro Laren, is rendered invisible and "out of phase" by chroniton particles from an experimental Romulan interphase generator gone amok. |
| Miral Paris | Lisa LoCicero | Prophecy, Endgame (VOY) | Daughter of Tom Paris and B'Elanna Torres, named after B'Elanna's mother Miral. |
| Owen Paris | Warren Munson, Richard Herd | Persistence of Vision (VOY) (recurring thereafter) | Father of Tom Paris, captain of the USS Al-Batani, Starfleet Vice Admiral, and instructor at Starfleet Academy. Oversees Project Pathfinder to make contact with Voyager in the Delta Quadrant. |
| Thomas Eugene Paris | Robert Duncan McNeill | Caretaker (VOY) (recurring thereafter); We'll Always Have Tom Paris (LDX) | Helmsman of the USS Voyager. |
| Patahk | Steve Rankin | The Enemy (TNG) | Romulan officer and one of two survivors of the crash of the Pi, a small Romulan ship, on the surface of Galorndon Core. Dies on the Enterprise-D after refusing to receive a ribosome donation from a Klingon. |
| John Frederick Paxton | Peter Weller | Demons (ENT), Terra Prime (ENT) | Leader of the Terra Prime movement. |
| Melora Pazlar | Daphne Ashbrook | Melora (DS9) | Elaysian Starfleet ensign and cartographer. Adapted for a low-gravity environment, she uses assistive devices in environments with Earth-like gravity. |
| Pelia | Carol Kane | The Broken Circle (SNW) (recurring thereafter) | Lanthanite engineer. Of an extremely long-lived species who has lived on earth for centuries. |
| Penk | Jeffrey Combs | Tsunkatse (VOY) | Leader of the fight-to-the-death game "Tsunkatse". |
| Perrin | Joanna Miles | Sarek (TNG), Unification (TNG) | Widow of Sarek. |
| Elise Picard | Kim Braden | GEN | Jean-Luc's wife in the Nexus. |
| Jean-Luc Picard | Patrick Stewart, David Tristan Birkin, Marcus Nash, Dylan Von Halle | Encounter at Farpoint (TNG) (recurring thereafter); Emissary (DS9); GEN; FCT; INS; NEM; Remembrance (PIC) (recurring thereafter) | Captain of the USS Enterprise-D. Also commands, at various times, the USS Stargazer, Enterprise-E, and (as Admiral) the Verity. Retires from Starfleet in 2385, but returns as Chancellor of Starfleet Academy. Son of Maurice and Yvette Picard, and father of Jack Crusher II. |
| Marie Picard | Samantha Eggar | Family (TNG) | Wife of Robert Picard, mother of René Picard, sister-in-law of Jean-Luc Picard. |
| Maurice Picard | Clive Church (TNG) James Callis (PIC) | Tapestry (TNG), The Star Gazer (PIC) (recurring thereafter) | Winemaker, father of Jean-Luc Picard. |
| René Picard | David Tristan Birkin Christopher James Miller | Family (TNG), GEN | Son of Marie and René Picard, nephew of Jean-Luc Picard. |
| Robert Picard | Jeremy Kemp | Family (TNG) | Husband of Marie Picard, father of René Picard, brother of Jean-Luc Picard. |
| Yvette Picard | Herta Ware (TNG), Madeline Wise (PIC) | Where No One Has Gone Before (TNG), The Star Gazer (PIC) (recurring thereafter) | Mother of Jean-Luc Picard. |
| Walter Pierce | Mark Rolston | Eye of the Beholder (TNG) | Starfleet engineer on the Enterprise-D. Part Betazoid, he left empathic traces in the ship's structure on his death in 2363. |
| Christopher Pike | Jeffrey Hunter, Sean Kenney, Bruce Greenwood, Anson Mount | The Cage (TC), The Menagerie (TOS), Star Trek: Early Voyages, ST09, ID, DSC, Strange New Worlds ([SNW) (recurring thereafter) | Captain of the Enterprise NCC-1701 before James T. Kirk. |
| Mark Piper | Paul Fix | Where No Man Has Gone Before (TOS) | Chief medical officer of the USS Enterprise NCC-1701 in 2265, before Leonard McCoy. |
| Vedek Porta | Robert Symonds | Accession (DS9) | Bajoran Vedek who kills a member of his group after he refuses to follow his D'Jarra. |
| Porthos | | Broken Bow (ENT) (recurring thereafter) | Captain Archer's dog, a beagle (but a Rottweiler in the Mirror Universe). One of a litter of four male puppies, all named for the Musketeers. |
| Erik Pressman | Terry O'Quinn | The Pegasus (TNG) | Rear admiral attached to Starfleet Intelligence in 2370. As mission commander of the Enterprise-D's search for the USS Pegasus NCC-53847, he was William Riker's first commanding officer. |
| Prinadora | None | Doctor Bashir, I Presume? (DS9) | Ferengi former wife of Rom and mother of their son Nog. Due to Rom's love for her, he signed an extension to their marriage contract (without reading the fine print); Prinadora's father was subsequently able to swindle Rom out of all his money, whereupon Prinadora left Rom for a richer man. |
| Captain Proton | Robert Duncan McNeill | Night (VOY) (recurring thereafter) | Lead character in the holodeck program The Adventures of Captain Proton, played by Tom Paris, Harry Kim, and other crew members. |
| Katherine Pulaski | Diana Muldaur | The Child (TNG) (recurring thereafter) | Starfleet commander and chief medical officer of the Enterprise-D in 2365. |

### Q

| Character | Actor | Appearances | Description |
| Q | John de Lancie | Encounter at Farpoint (TNG) (recurring thereafter); Q-Less (DS9); Death Wish (VOY) (recurring thereafter); The Star Gazer (PIC) (recurring thereafter) | The Q played by de Lancie is the most prominently appearing member of the Q Continuum. He puts Jean-Luc Picard and the crew of the Enterprise on trial, and meddles in their ongoing adventures. |
| Q | Corbin Bernsen | Deja Q (TNG) | Corbin Bernsen plays a Q who visits from the Q Continuum after John de Lancie's character is expelled and made human as a punishment. |
| Q | Suzie Plakson | The Q and the Grey (VOY) | Suzie Plakson plays an old friend of John de Lancie's character who fights him in a civil war within the Q continuum. The war is ended when the two of them agree to have a child together. |
| Q | Harve Presnell | The Q and the Grey (VOY) | Harve Presnell plays a colonel in the civil war against John de Lancie's character. |
| Q | Keegan de Lancie | Q2 (VOY) | John de Lancie's son Keegan plays his character's son, who was conceived in "The Q and the Grey". |
| Q or Quinn | Gerrit Graham | Death Wish (VOY) | Gerrit Graham plays a Q who wishes to leave the Continuum and become a human so that he can commit suicide. As a human he takes the name Quinn. |
| Qatai | W. Morgan Sheppard | Bliss (VOY) | Man who hunts a large, spacefaring bioplasmic life form for at least 40 years. |
| Dr. Dalen Quaice | Bill Erwin | Remember Me (TNG) | Old colleague of Dr. Beverly Crusher. |
| Quark | Armin Shimerman | Emissary (DS9) (recurring thereafter) | Ferengi who owns a bar on the Promenade of Deep Space Nine. |
| Gregory Quinn | Ward Costello | Coming of Age (TNG), Conspiracy (TNG) | Starfleet admiral and friend of Jean-Luc Picard. |

### R

| Character | Actor | Appearances | Description |
| Rakal | Marina Sirtis | Face of the Enemy (TNG) | Romulan major and Tal Shiar operative, killed by dissidents in the Romulan Underground. |
| Sariel Rager | Lanei Chapman | Galaxy's Child, Night Terrors, Relics, Schisms (all TNG) | Conn officer on the Enterprise-D (numerous episodes, on-screen credit for four talking episodes). |
| Devinoni Ral | Matt McCoy | The Price (TNG) | Human-Betazoid negotiator vying for control of the Barzan Wormhole. |
| Ramirez | Scott Leva | To the Death (DS9) | Security officer from Defiant. Killed on the Gateway planet by Jem'Hadar. |
| Ramos | Dennis Madalone | Heart of Glory (TNG) | Human Starfleet security noncommissioned officer on the Enterprise-D in 2364. Shot during Korris's and Konmel's escape from the Security 3 brig. |
| Ranar | None | The Pegasus (TNG) (mentioned) | Admiral and chief of Starfleet Security in 2370. |
| Janice Rand | Grace Whitney | The Man Trap (TOS) (recurring thereafter) | Captain Kirk's clerical assistant. |
| Rudy Ransom | John Savage | Equinox (VOY) | Captain of the Federation starship USS Equinox, stranded in the Delta Quadrant. |
| Berlinghoff Rasmussen | Matt Frewer | A Matter of Time (TNG) | Con artist and time traveler. |
| Clare Raymond | Gracie Harrison | The Neutral Zone (TNG) | 20th-century human cryogenically frozen and discovered by the Enterprise-D. |
| Cyrus Redblock | Lawrence Tierney | The Big Goodbye (TNG) | Fictional 1940s crime boss, from Picard's "Dixon Hill" holodeck adventures. |
| Redjac | None | Wolf in the Fold (TOS) | Non-corporeal alien, drawing sustenance from the emotion of fear, capable of inhabiting corporeal beings and taking control of their bodies. |
| Malcolm Reed | Dominic Keating | Broken Bow (ENT) (recurring thereafter) | Lieutenant; Tactical and Armory Officer, USS Enterprise NX-01. |
| Rekar | Judson Scott | Message in a Bottle (VOY) | Romulan commander who hijacks the USS Prometheus NX-59650. |
| Dexter Remmick | Robert Schenkkan | Coming of Age (TNG), Conspiracy (TNG) | Starfleet lieutenant commander and member of the Inspector General's Office. Investigates the crew of the Enterprise-D. |
| Retaya | Carlos LaCamara | Improbable Cause (DS9) | Flaxian merchant dealing in fine wares, mostly fabrics and fragrances. Hired by the Tal Shiar to kill Elim Garak. |
| Paul Rice | Marco Rodriguez | The Arsenal of Freedom (TNG) | Starfleet captain of the light cruiser USS Drake, which disappeared in the Lorenze Cluster; Academy friend of William Riker. |
| Kyle Riker | Mitchell Ryan | The Icarus Factor (TNG) | Civilian strategist; father of William Riker and Thomas Riker. |
| Thomas Riker | Jonathan Frakes | Second Chances (TNG), Defiant (DS9) | Transporter twin of William Riker and member of the Maquis resistance. |
| William Thomas Riker | Jonathan Frakes | Encounter at Farpoint (TNG) (recurring thereafter); Death Wish (VOY); These Are the Voyages... (ENT); GEN; FCT; INS; NEM; Nepenthe (PIC) (recurring thereafter); No Small Parts (LDX) (recurring thereafter) | First officer of the Enterprise-D and Enterprise-E under Captain Picard; Captain of the USS Titan. Husband of Deanna Troi, father of Thaddeus and Kestra Riker. Retires around 2390 but remains on reserve; becomes Acting Captain of the USS Zheng He in 2399, and reactivates his command thereafter. |
| Kevin Thomas Riley | Bruce Hyde | The Naked Time (TOS), The Conscience of the King (TOS) | Navigator of the starship Enterprise and survivor of Tarsus IV. |
| Rislan | James Noah | Displaced (VOY) | Nyrian scientist who collaborates with Torres. |
| Roy Ritterhouse | J. G. Hertzler | Far Beyond the Stars (DS9) | Artist for a 1950s-era science fiction magazine in a vision experienced by Benjamin Sisko. |
| Riva | Howie Seago | Loud as a Whisper (TNG) | Deaf Federation negotiator; along with his team of interpreters, ferried to a mission by the Enterprise-D. |
| Rixx | Michael Berryman | Conspiracy (TNG) | Bolian captain of the USS Thomas Paine. He joins fellow captains Walker Keel and Tryla Scott on Dytallix B to warn Picard about the alien conspiracy within Starfleet. |
| Ro Laren | Michelle Forbes | Ensign Ro (TNG) (recurring thereafter); Imposters (PIC) | Bajoran Starfleet officer released from prison to serve aboard the Enterprise-D; later, Maquis freedom fighter, Federation prisoner, and finally Starfleet Intelligence recruit. |
| Richard Robau | Faran Tahir | ST09 | Captain of the USS Kelvin who relinquishes command to James T. Kirk's father, George Kirk. Killed by Nero (Eric Bana). |
| Lt. Bronwyn Gail Robinson | Teri Hatcher | The Outrageous Okona (TNG) | Transporter chief on the Enterprise-D. |
| Rain Robinson | Sarah Silverman | Future's End (VOY) | SETI employee. |
| Rodek | Tony Todd | Sons of Mogh (DS9) | Son of Noggra. |
| Amanda Rogers | Olivia d'Abo | True Q (TNG) | Member of the Q Continuum, raised as a human. |
| Rom | Max Grodénchik | Emissary (DS9) (recurring thereafter) | Ferengi, brother of Quark. Becomes Grand Nagus shortly after Zek's retirement. |
| Romulan | Darwyn Carson | Improbable Cause (DS9) | Tal Shiar agent. |
| Romulan Commander | James Doohan | The Survivor (TAS) | Commander of two D7-class battle cruisers; captures the Enterprise. |
| Romulan Commander | Mark Lenard | Balance of Terror (TOS) | First Romulan seen by Starfleet officers; commander of the Praetor's flagship Bird-of-Prey in destructive attacks against Federation outposts 2, 3, 4 and 8 along the Romulan Neutral Zone in 2266. |
| Romulan Commander | Joanne Linville | The Enterprise Incident (TOS) | Commander of three Romulan warships which captured the Enterprise in 2269. |
| Romulan Commander | J. Patrick McCormack | NEM | Present in an Imperial Senate hearing when Praetor Hiren refuses to pursue an alliance with Shinzon of Remus. |
| Romulan Commander | David Ralphe | NEM | Proposes an alliance between the Romulan military and Shinzon of Remus. |
| Romulan Commander | Maurice Roëves | The Chase (TNG) | Commander of a Romulan Warbird. Together with Picard and two Cardassians, witnesses an ancient holographic message. |
| Romulan Commander | Lou Scheimer | The Practical Joker (TAS) | Commander of three D7-class battle cruisers. Ambushes the Enterprise, before encountering a strange energy field in space. |
| Romulan Commander | Peter Vogt | Tin Man (TNG) | Commander of the second Romulan Warbird sent to make first contact with Tin Man. |
| Romulan Crewman | Norm Prescott | The Practical Joker (TAS) | Crewman on the Romulan flagship in 2269. |
| Rondon | Daniel Riordan | Coming of Age (TNG) | Zaldan Starfleet crewman who was assigned to the operations division while based at Relva VII in 2364. Involved in Wesley Crusher's Academy entrance test. |
| Ronin | Duncan Regehr | Sub Rosa (TNG) | Aniphasic alien, killed by Doctor Crusher. |
| William J. Ross | Barry Jenner | A Time to Stand (DS9) (recurring thereafter) | Field Commander of Starfleet forces during the Dominion War. |
| Connaught Rossa | Barbara Townsend | Suddenly Human (TNG) | Starfleet vice admiral and biological grandmother of Jeremiah Rossa. |
| Jeremiah Rossa | Chad Allen | Suddenly Human (TNG) | See Jono, human born Jeremiah Rossa, adopted by Talarian Captain Endar in accordance with Talarian customs. |
| Herbert Rossoff | Armin Shimerman | Far Beyond the Stars (DS9) | Writer for a 1950s era science fiction magazine in a vision experienced by Benjamin Sisko. |
| Michael Rostov | Joseph Will | Vox Sola (ENT) (recurring thereafter) | Engineering crewman on Jonathan Archer's Enterprise (NX-01). |
| Jackson Roykirk | Marc Daniels | The Changeling (TOS), Watcher (PIC) | 21st-century robotics engineer and builder of the space probe Nomad. |
| Alexander Rozhenko | Jon Paul Steuer, Brian Bonsall, James Sloyan, Marc Worden | Reunion (TNG) (recurring thereafter); Sons and Daughters (DS9) (recurring thereafter) | Son of Worf. Raised at various points by his mother, father, and paternal grandparents. Joins the Klingon military during the Dominion War. |
| Helena Rozhenko | Georgia Brown | Family (TNG) (recurring thereafter) | Adoptive mother of Worf, mother of Nikolai, wife of Sergey, and guardian of Worf's son Alexander. |
| Nikolai Rozhenko | Paul Sorvino | Homeward (TNG) | Son of Helena and Sergey, and adoptive brother of Worf. |
| Sergey Rozhenko | Theodore Bikel | Family (TNG) | Adoptive father of Worf, father of Nikolai, husband of Helena, and guardian of Worf's son Alexander; chief petty officer aboard the USS Intrepid. |
| Gul Rusot | John Vickery | The Changing Face of Evil, When It Rains..., Tacking into the Wind (DS9) | Cardassian military officer; old friend and second-in-command of Legate Damar. |
| Benny Russell | Avery Brooks | Far Beyond the Stars, Shadows and Symbols (DS9) | 1950s African-American science-fiction writer in a vision experienced by Benjamin Sisko. |
| Ruwon | Jack Shearer | Visionary (DS9) | Romulan officer on a delegation to Starbase Deep Space Nine to study Starfleet Intelligence reports on the Dominion. |
| Burt Ryan | Marc Alaimo | Far Beyond the Stars (DS9) | 1950s city police officer in a vision experienced by Benjamin Sisko. |

### S

| Character | Actor | Appearances | Description |
| Saavik | Kirstie Alley, Robin Curtis | WOK, SFS, TVH | Vulcan-Romulan Starfleet lieutenant junior grade; Spock's protege. |
| Sakkath | Rocco Sisto | Sarek (TNG) | Assistant to Sarek during the Legaran negotiations. |
| Salia | Jaime Hubbard | The Dauphin (TNG) | Future ruler of Daled IV, ferried to her planet by the Enterprise-D. |
| Sarek | Mark Lenard, Jonathan Simpson, Ben Cross, James Frain | Journey to Babel (TOS), Sarek, Redemption (TNG), TMP, SFS, TVH, TFF, TUC, ST09 | Vulcan ambassador; father of Spock and Sybok. |
| Sarjenka | Nikki Cox | Pen Pals (TNG) | Native of a seismically active planet and friend of Data. |
| Saru | Doug Jones | DSC, "The Brightest Star" (ST) | Kelpien First Officer of the USS Discovery. |
| Satan's Robot | Tarik Ergin | Night (VOY) (recurring thereafter) | Robot character in The Adventures of Captain Proton holodeck program. |
| Norah Satie | Jean Simmons | The Drumhead (TNG) | Starfleet admiral and head of a paranoia-fueled investigation aboard the Enterprise-D. |
| Saunders | Eric Pierpoint | For the Uniform (DS9) | Captain of the starship Malinche assigned to take up the search for renegade Michael Eddington after the Defiant becomes disabled. |
| Montgomery Scott | James Doohan, Simon Pegg | TOS, TAS, TMP, WOK, SFS, TVH, TFF, TUC, GEN, Relics (TNG), ST09, STID, STB | Chief Engineer of the USS Enterprise and Enterprise-A under Captain Kirk. |
| Tryla Scott | Ursaline Bryant | Conspiracy (TNG) | Starfleet captain; helps warn Picard of an alien takeover of Starfleet. |
| Sek | Ronald Robinson | Repression (VOY) | Firstborn son of Tuvok and T'Pel. |
| Sela | Denise Crosby | The Mind's Eye (TNG), Redemption, Part II (TNG), Unification, Part II (TNG) | Romulan commander and hybrid daughter of an alternate timeline version of Tasha Yar. Supervises the "conditioning" of Geordi La Forge aboard her Warbird, provides weapons to the House of Duras in the Klingon Civil War, and coordinates a plan to invade the planet Vulcan. |
| Dr. Selar | Suzie Plakson | The Schizoid Man (TNG) | Vulcan Starfleet medical officer and lieutenant on the Enterprise-D. |
| Selok | Sierra Pecheur | Data's Day (TNG) | Romulan subcommander. In her undercover identity as Vulcan ambassador T'Pel, one of the Federation's most honored diplomats. |
| Septimus | Ian Wolfe | Bread and Circuses (TOS) | Roman citizen and Sun (Son) worshipper on planet 892-IV. |
| Seska | Martha Hackett | Parallax (VOY) (recurring thereafter) | Cardassian undercover operative; infiltrates the Maquis posing as a Bajoran and is stranded with the rest of the USS Voyager crew in the Delta Quadrant. Later, joins the Kazon-Nistrim and becomes an enemy of the Voyager crew and Captain Kathryn Janeway. |
| Seven of Nine | Jeri Ryan | Scorpion Part II (VOY) (recurring thereafter); Absolute Candor (PIC) (recurring thereafter) | Former Borg drone, liberated by the USS Voyager and thereafter a member of its crew. Later, member of the Fenris Rangers, then Commander and subsequently Captain of the USS Titan. |
| Gideon Seyetik | Richard Kiley | Second Sight (DS9) | Terraformer. |
| Shakaar Edon | Duncan Regehr | Shakaar (DS9) (recurring thereafter); | Leader of Bajoran resistance during Cardassian occupation; later, First Minister of Bajor. |
| Shelby | Elizabeth Dennehy | The Best of Both Worlds (TNG), Võx (PIC), Star Trek: New Frontier spin-off novels. | Starfleet Lieutenant Commander assigned to the Enterprise-D to provide assistance against the Borg. Field-promoted to commander and first officer when Picard was assimilated. Becomes fleet admiral before the events of Star Trek: Picard and briefly commands the Enterprise-F before the Borg kill her in 2401. |
| Jim Shimoda | Benjamin W.S. Lum | The Naked Now (TNG) | Assistant chief engineer on the Enterprise-D in 2364. Under the influence of the polywater intoxication, removes all the isolinear chips from the engine control station. |
| Shinzon | Tom Hardy | NEM | An imperfect clone of Captain Jean-Luc Picard created by the Romulans with the intent of replacing Picard. This plan is abandoned and Shinzon is exiled to Remus, where he leads soldiers during the Dominion War. Later, seizes control of the Romulan Senate in a coup d'etat, and lures Picard to the planet with peace overtures. |
| Thy'lek Shran | Jeffrey Combs | The Andorian Incident (ENT) (recurring thereafter) | Andorian commander of the Andorian Imperial Guard starship Kumari. Assists Jonathan Archer in impeding the Xindi superweapon's deployment against Earth. |
| Shras | Reggie Nalder | Journey to Babel (TOS) | Andorian ambassador to the 2267 "Babel" conference regarding the admission of Coridan into the Federation. |
| Jaglom Shrek | James Cromwell | Birthright (TNG) | Yridian with information to sell about Klingons captured by Romulans at Khitomer. |
| Shresht | None | Novelisations | Insectoid representative on the Xindi Council. |
| Khan Noonien Singh | Ricardo Montalbán, Benedict Cumberbatch | Space Seed (TOS), WOK, ID | Genetically enhanced superman from the mid-1990s. Attempts to seize control of the Enterprise and is marooned on Ceti Alpha V by James Kirk; 15 years later, takes revenge by hijacking the USS Reliant NCC-1864 and attacking the Enterprise. |
| Sirol | Michael Mack | The Pegasus (TNG) | Romulan commander of the IRW Terix, assigned to locate and retrieve the USS Pegasus NCC-53847. |
| Benjamin Lafayette Sisko | Avery Brooks | Emissary (DS9) (recurring thereafter) | Commanding officer of Starbase Deep Space 9 (DS9) and Emissary to the Bajoran Prophets. Promoted from commander to captain after nearly three years at DS9. Father of Jake Sisko and widower of Jennifer Sisko. |
| Jake Sisko | Cirroc Lofton, Thomas Hobson, Tony Todd | Emissary (DS9) (recurring thereafter) | Son of Benjamin and Jennifer Sisko. |
| Jennifer Sisko | Felecia M. Bell | Emissary (DS9) (recurring thereafter) | Wife of Benjamin Sisko and mother of Jake Sisko. Killed at Wolf 359, but survived in the mirror universe. |
| Joseph Sisko | Brock Peters | Homefront (DS9) (recurring thereafter) | New Orleans restaurateur and father of Benjamin Sisko. |
| Korenna Sisko | Galyn Görg | The Visitor (DS9) | Bajoran wife of Jake Sisko in an alternate future. |
| Sito Jaxa | Shannon Fill | The First Duty (TNG), Lower Decks (TNG), various novelisations | Bajoran Starfleet officer. While a cadet, implicated (together with Wesley Crusher) in the death of a fellow cadet. As a security ensign aboard the Enterprise-D, killed on a mission to return Cardassian double agent Joret Dal to his home territory. |
| Jessica Sloan | Jacqueline Schultz | Extreme Measures (DS9) | Wife of Section 31 operative Luther Sloan. |
| Luther Sloan | William Sadler | Inquisition (DS9) (recurring thereafter) | Section 31 operative who repeatedly attempts to recruit Bashir. |
| Lily Sloane | Alfre Woodard | FCT, Fissure Quest (LOW) | Twenty-first-century human treated for radiation poisoning on the Enterprise. Assists Zefram Cochrane in building the Phoenix, the first warp-capable ship on Earth. Alternate universe Sloane in LOW, where she assisted Cochrane in building the first quantum reality drive, then commands the Beagle in exploring the multi-verse. |
| Smith | Andrea Dromm | Where No Man Has Gone Before (TOS) | Command-division yeoman on the Enterprise; close to Gary Mitchell. |
| Soji Asha | Isa Briones | Remembrance (PIC) (recurring thereafter) | Data's daughter. |
| Solbor | James Otis | 'Til Death Do Us Part, Strange Bedfellows, The Changing Face of Evil (DS9) | Bajoran Ranjen who serves as loyal assistant to Kai Winn until she stabs him in the back, killing him. |
| Sonak | Jon Rashad Kamal | TMP | Vulcan Starfleet commander assigned to the Enterprise as science officer during the V'Ger crisis. Killed in a transporter accident while beaming up. |
| Adam Soong | Brent Spiner | Fly Me to the Moon (PIC) (recurring thereafter) | Unethical geneticist whose methods cause his research license to be revoked. While looking for a cure for his daughter Kore's genetic disease, he is approached by Q and later by the Borg Queen, who lure him into helping them and opposing Picard. Ancestor of Noonien Soong. |
| Altan Inigo Soong | Brent Spiner | Et in Arcadia Ego, The Bounty (PIC) | Son of Noonien Soong, and Data's human "brother". Co-creator of the Asha twins along with Bruce Maddox, and later the developer of the "golem" android. Briefly appears as a hologram in the Daystrom Institute. |
| Arik Soong | Brent Spiner | Borderland (ENT) (recurring thereafter) | Criminal creator of genetically engineered humans. Ancestor of Noonien Soong. |
| Juliana Soong | Fionnula Flanagan | Inheritance (TNG) | Deceased wife of Noonien Soong, whose consciousness was transferred at her death to an identical Soong-type android. |
| Noonien Soong | Brent Spiner | Brothers (TNG) (recurring thereafter) | Human cyberneticist; father of Altan, husband of Juliana, and creator of Data, Lore, a replica of Juliana, B-4, and two other prototype androids. Like Khan Noonien Singh, named for a friend of Gene Roddenberry's. |
| Tolian Soran | Malcolm McDowell | GEN | El-Aurian scientist desperate to return to the Nexus. |
| Sovak | Max Grodénchik | Captain's Holiday (TNG) | Ferengi seeking to profit from an archaeological search for the Tox Uthat. |
| Soval | Gary Graham | Broken Bow (ENT) (recurring thereafter) | Vulcan ambassador to Earth in the 22nd century. |
| Spock | Leonard Nimoy, Ethan Peck, Zachary Quinto | TOS, TAS, Unification 1&2 (TNG), DSC, SNW, TMP, WOK, SFS, TVH, TFF, TUC, ST09, STID, STB | Son of Vulcan ambassador Sarek and human Amanda Grayson. Science Officer and First Officer on the USS Enterprise and, subsequently, the USS Enterprise-A; Captain at Starfleet Academy; Federation Ambassador. |
| Spot | | Data's Day (TNG) (recurring thereafter), GEN, NEM | Data's pet cat. |
| Ssestar | John Durbin | Lonely Among Us (TNG) | Selay delegate to the summit with the Anticans on Parliament. |
| Henry Starling | Ed Begley, Jr. | Future's End (VOY) | 20th-century pothead-turned-entrepreneur after discovering a 29th-century spacecraft that crash-lands near his campsite. |
| Stel | Larc Spies | The Forge (ENT) | Vulcan chief investigator of the Vulcan Security Directorate in 2154. Carries a bomb into the United Earth Embassy on Vulcan. |
| Stocker | Charles Drake | The Deadly Years (TOS) | Starfleet commodore and bureaucrat. Convenes an extraordinary competency hearing for Kirk, and subsequently assumes command of the Enterprise. |
| Stol | | Q-Less (DS9) | Cousin of Quark and Rom. Bids 500 bars of gold-pressed latinum for a bejeweled dagger from the Gamma Quadrant during Vash's auction. |
| Stone | Percy Rodriguez | Court Martial (TOS) | Starfleet commodore and commanding officer of Starbase 11. Convenes a court-martial of Kirk regarding the death of Lieutenant Commander Benjamin Finney. |
| Stonn | Lawrence Montaigne | Amok Time (TOS) | Vulcan; T'Pring's lover and Spock's rival for her affections. |
| Dr. Paul Stubbs | Ken Jenkins | Evolution (TNG) | Human astrophysicist. Tries to wipe out a race of nanites to further his own research. |
| Styles | James Sikking | SFS | Starfleet officer; captain of the USS Excelsior (NX-2000). |
| Lon Suder | Brad Dourif | Meld, Basics Part 1 & 2 (VOY) | Betazoid Maquis brevet ensign. Helps retake Voyager after its commandeering by the Kazon. |
| Michael Sullivan | Fintan McKeown | Fair Haven (VOY) (recurring thereafter) | Holographic character in Tom Paris's Fair Haven, owner of a pub in a quaint Irish village. Becomes romantically involved with Captain Janeway, who makes several modifications to his program. |
| Demora Sulu | Jacqueline Kim, Rihanne Quinn | GEN, STB | Ensign and pilot (helm officer) on the Enterprise-B; daughter of Hikaru Sulu. |
| Hikaru Sulu | George Takei, John Cho | TOS, TAS, TMP, WOK, SFS, TVH, TFF, TUC, GEN, Flashback (VOY), ST09, STID, STB | Helmsman of the USS Enterprise and Enterprise-A under Captain Kirk; Captain of the USS Excelsior. |
| Surak | Barry Atwater, Bruce Gray | The Savage Curtain (TOS), Awakening (ENT) | Legendary Vulcan philosopher. |
| Suran | Jude Ciccolella | NEM | Romulan commander who assures Praetor Shinzon of the fleet's allegiance. |
| Sutok | Steve Kehela | Fair Trade (VOY) | Drug addict who buys his drugs at the Nekrit Supply Depot. |
| Sybok | Laurence Luckinbill | TFF, The Serene Squall (SNW) | Sarek's son by a Vulcan princess; Spock's half-brother. Hijacks the Enterprise-A in attempt to reach God at the center of the galaxy. |
| Syrran | Michael Nouri | The Forge (ENT) | Vulcan in possession of Surak's katra. Along with his followers, the Syrrannites, seeking the Kir'Shara, an ancient artifact containing Surak's original writings. Introduces himself as "Arev" to Jonathan Archer and T'Pol. |