2021

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| align="center" |Timeline
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==2021 events==
*Jessica Knight subsequently joined the main NCIS Major Case Response Team, officially replacing Eleanor Bishop who had resigned from NCIS.
*Leroy Jethro Gibbs officially retired from NCIS.
*Alden Parker becomes the new NCIS Special Agent in Charge of the Major Case Response Team, replacing Gibbs.
==Broadcast Media==
===Television===
*January 3, 2021- Overdue (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*January 3, 2021- Operation Drano: Part 1 (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*January 10, 2021- Love Kills (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*January 10, 2021- Operation Drano: Part 2 (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*January 17, 2021- A Fait Accompli (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*January 17, 2021- Leda and the Swan: Part 1 (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*January 19, 2021- Sunburn (episode) and Head of the Snake (NCIS episode), the NCIS Season 18 episodes both air for the first time.
*January 26, 2021- 1mm (episode), the NCIS Season 19 episode airs for the first time.
*February 9, 2021- The First Day (episode), the NCIS Season 18 episode airs for the first time.
*February 14, 2021- The Frogman's Daughter (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*February 14, 2021- Leda and the Swan: Part 2 (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*February 21, 2021- Russia, Russia, Russia (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*February 21, 2021- Into Thin Air (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*February 28, 2021- Can't Take My Eyes Off You (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*February 28, 2021- Homeward Bound (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*March 2, 2021- True Believer (episode), the NCIS Season 18 episode airs for the first time. This episode marks the final appearance of Maria Bello (Jacqueline Sloane).
*March 9, 2021- Winter Chill (episode), the NCIS Season 18 episode airs for the first time.
*March 16, 2021- Watchdog (episode), the NCIS Season 18 episode airs for the first time.
*March 28, 2021- Red Rover, Red Rover (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*March 28, 2021- Stashed (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*April 4, 2021- The Noble Maidens (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*April 4, 2021- Once Upon a Time (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*April 6, 2021- Gut Punch (episode), the NCIS Season 18 episode airs for the first time.
*April 27, 2021- Sangre (episode), the NCIS Season 18 episode airs for the first time.
*May 2, 2021- Imposter Syndrome (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*May 2, 2021- Choices (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*May 4, 2021- Misconduct (episode), the NCIS Season 18 episode airs for the first time.
*May 9, 2021- Signs of Change (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*May 9, 2021- Illusions (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*May 11, 2021- Unseen Improvements (episode), the NCIS Season 18 episode airs for the first time.
*May 16, 2021- Through the Looking Glass (episode), the NCIS: Los Angeles Season 12 episode airs for the first time.
*May 16, 2021- Runs in the Family (episode), the NCIS: New Orleans Season 7 episode airs for the first time.
*May 18, 2021- Blown Away (episode), the NCIS Season 18 episode airs for the first time. 
*May 23, 2021- A Tale of Two Igors (episode), the NCIS: Los Angeles Season 12 finale episode airs for the first time. This episode marks the final appearance of Barrett Foa (Eric Beale) and Renee Felice Smith (Nell Jones) although Felice Smith would return two years later in the NCIS: Los Angeles Season 14 series finale episode.
*May 23, 2021- Laissez Les Bon Temps Rouler (episode), the NCIS: New Orleans Season 7 finale as well as the NCIS: New Orleans series finale airs for the first time.
*May 25, 2021- Rule 91 (episode), the NCIS Season 18 finale episode airs for the first time. This episode also marks the final appearance of Emily Wickersham (Eleanor Bishop).
*September 20, 2021- Blood in the Water (episode), the NCIS Season 19 premiere episode airs for the first time.
*September 20, 2021- Pilot (NCIS: Hawaii episode), the NCIS: Hawaii Season 1 premiere episode airs for the first time.
*September 27, 2021- Nearly Departed (episode), the NCIS Season 19 episode airs for the first time. This episode marks the debut appearance of Gary Cole (Alden Parker).
*September 27, 2021- Boom (NCIS: Hawaii episode), the NCIS: Hawaii Season 1 episode airs for the first time.
*October 4, 2021- Road to Nowhere (episode), the NCIS Season 19 episode airs for the first time.
*October 4, 2021- Recruiter (episode), the NCIS: Hawaii Season 1 episode airs for the first time.
*October 10, 2021- Subject 17 (episode), the NCIS: Los Angeles Season 13 premiere episode airs for the first time.
*October 17, 2021- Fukushu (episode), the NCIS: Los Angeles Season 13 episode airs for the first time.
*October 18, 2021- Face the Strange (episode), the NCIS Season 19 episode airs for the first time.
*October 18, 2021- Gaijin (episode), the NCIS: Hawaii Season 1 episode airs for the first time.
*October 24, 2021- Indentured (episode), the NCIS: Los Angeles Season 13 episode airs for the first time.
*October 31, 2021- Sorry for Your Loss (episode), the NCIS: Los Angeles Season 13 episode airs for the first time.
*November 1, 2021- False Start (episode), the NCIS Season 19 episode airs for the first time.
*November 1, 2021- The Tourist (episode), the NCIS: Hawaii Season 1 episode airs for the first time.
*November 7, 2021- Divided We Fall (episode), the NCIS: Los Angeles Season 13 episode airs for the first time.
*November 8, 2021- Docked (episode), the NCIS Season 19 episode airs for the first time.
*November 8, 2021- Rescuers (episode), the NCIS: Hawaii Season 1 episode airs for the first time.
*November 21, 2021- Sundown (episode), the NCIS: Los Angeles Season 13 episode airs for the first time.
*November 29, 2021- Peacekeeper (episode), the NCIS Season 19 episode airs for the first time.
*November 29, 2021- Legacy (NCIS: Hawaii episode), the NCIS: Hawaii Season 1 episode airs for the first time.
*December 6, 2021- Collective Memory (episode), the NCIS Season 19 episode airs for the first time.
*December 6, 2021- Imposter (episode), the NCIS: Hawaii Season 1 episode airs for the first time.
Category:Timeline