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- For information dealing with this year in the timeline of the fictional Star Trek universe, see 1991.
Production
January
- 2 January - Pato Guzman dies.
- 7 January - TNG: "Data's Day" airs.
- 7 January - 15 January - Seven days of filming on TNG: "Night Terrors" on Paramount Stage 8, 9, and 16.
- 8 January - Christian Maguire is born.
- 12 January - Keye Luke dies.
- 16 January - 25 January - Eight days of filming on TNG: "Identity Crisis" on Paramount Stage 8, 9, and 16.
- 22 January - Second unit and blue screen inserts were filmed on Paramount Stage 13 for the episodes TNG: "Clues" and TNG: "Night Terrors".
- 28 January - TNG: "The Wounded" airs.
- 28 January - 31 January - Four days of filming on TNG: "The Nth Degree".
- 30 January - An additional scene for TNG: "First Contact" was filmed on Paramount Stage 8.
February
- 1 February - 5 February - Three days of filming on TNG: "The Nth Degree".
- 4 February - TNG: "Devil's Due" airs.
- UK VHS releases: TOS volumes 37 and 38, TNG volume 9.
- 6 February - 15 February - Eight days of filming on TNG: "Qpid" including a location shoot at Descanso Gardens.
- 11 February - TNG: "Clues" airs.
- 18 February - TNG: "First Contact" airs.
- 19 February - 27 February - Seven days of filming on TNG: "The Drumhead".
- 22 February - Inserts shooting on Paramount Stage 8 and 16 for TNG: "The Nth Degree".
- 27 February - 28 February - Two days of filming on TNG: "Half a Life".
- Pocket TOS #53: Ghost Walker by Barbara Hambly is published by Pocket Books.
- DC TNG volume 2 #16: "I Have Heard the Mermaids Singing" is published.
March
- 1 March - 7 March - Five days of filming on TNG: "Half a Life".
- 11 March - TNG: "Galaxy's Child" airs.
- 18 March - TNG: "Night Terrors" airs.
- UK VHS releases: TOS volumes 39 and 40 (end).
- 20 March - 28 March - Seven days of filming on TNG: "The Mind's Eye".
- 25 March - TNG: "Identity Crisis" airs.
- DC TNG volume 2 #17: "Forbidden Fruit" is published.
April
- 1 April - TNG: "The Nth Degree" airs.
- UK VHS release: TNG volume 10.
- 1 April - 9 April - Seven days of filming on TNG: "In Theory".
- 8 April - UK VHS release: TNG volume 11.
- 9 April - An additional scene for TNG: "The Mind's Eye" was filmed on Paramount Stage 9.
- 10 April - Paul Stader dies.
- 10 April - 18 April - Seven days of filming on TNG: "Redemption".
- 11 April - Publicity photo shoot for Gene Roddenberry at the transporter room set.
- 16 April - Filming begins on Star Trek VI: The Undiscovered Country.
- 18 April - Second unit shots and inserts were filmed for TNG: "Half a Life" and TNG: "The Host".
- 22 April - TNG: "Qpid" airs.
- 29 April - TNG: "The Drumhead" airs.
- Pocket TOS #54: A Flag Full of Stars by Brad Ferguson is published by Pocket Books.
- DC TNG volume 2 #18: "The Weapon" is published.
May
- 6 May - TNG: "Half a Life" airs.
- 7 May - UK VHS releases: TNG volumes 12 and 13 (end season 1).
- Release on a Tuesday instead of the usual Monday due to May Bank Holiday.
June
- 3 June - TNG: "In Theory" airs.
- UK VHS releases: TNG volumes 14 and 15.
- 17 June - TNG: "Redemption", the 100th episode of The Next Generation airs.
- 18 June - Chuck Couch dies.
- Pocket TOS #55: Renegade by Gene DeWeese is published by Pocket Books.
- Pocket TNG novel Boogeymen is published.
July
Star Trek VI: The Undiscovered Country
- 1 July - UK VHS releases: TNG volumes 16 and 17.
- 2 July - Filming ends on Star Trek VI: The Undiscovered Country.
- TNG Season 5 begins production.
- TNG: "Darmok" is filmed between 18 July 1991 and 26 July 1991 on Paramount Stages 8, 9, 16, and on location at Bronson Canyon.
August
- 5 August - Murray Golden dies.
- 8 August - An additional day of shooting for the episode "Darmok" was filmed on this Thursday. It included shots in front of a blue screen with stunt actor Rex Pierson and was filmed at Paramount Stage 9 on second unit with assistant director Arlene Fukai.
- 12 August - UK VHS releases: TNG volumes 18 and 19.
- 20 August - Irving A. Feinberg dies.
- 21 August - Jesse James Rutherford is born.
- Pocket Books #56: Legacy by Michael Jan Friedman is published by Pocket Books.
September
- 2 September - UK VHS releases: TNG volumes 20 and 21.
- 15 September - John Hoyt dies.
- 23 September - "Redemption II", the first episode of the fifth season of Star Trek: The Next Generation, premieres.
- 28 September - Star Trek 25th Anniversary Special airs.
- 30 September - TNG: "Darmok" airs.
- Unknown - The plans for Paramount Stage 9 are revised.
October
- 7 October - TNG: "Ensign Ro" airs.
- UK VHS releases: TNG volumes 22, 23, and 24 (end season 2).
- 9 October - Thalmus Rasulala dies.
- 14 October - TNG: "Silicon Avatar" airs.
- 21 October - TNG: "Disaster" airs.
- UK VHS releases: TNG volumes 25, 26, and 27.
- 24 October - Star Trek creator Gene Roddenberry passes away at the age of 70, shortly after the 25th anniversary of his creation. The TNG episode "Hero Worship" is in production at the time, and the two-part episode "Unification I" and "Unification II" is dedicated to Roddenberry's memory.
- 28 October - TNG: "The Game" airs.
November
- 4 November - Leonard Nimoy makes a crossover appearance as Spock on the TNG episode "Unification I", the first episode in a two-part event.
- UK VHS releases: TNG volumes 28, 29, and 30.
- 11 November - TNG: "Unification II" airs.
- 18 November - TNG: "A Matter of Time" airs.
- Pocket TOS #57: The Rift by Peter David is published by Pocket Books
- Unknown - The Star Trek Logs: An MTV Big Picture Special Edition airs.
December
- 2 December - UK VHS releases: TAS volumes 1 and 2, TNG volumes 31, 32, and 33.
- 6 December - Star Trek VI: The Undiscovered Country premieres in US theaters.
Unknown
- UK VHS releases (Movies): Star Trek: The Motion Picture, Star Trek III: The Search for Spock (25th Anniversary rereleases), Star Trek V: The Final Frontier, and Star Trek: The Movies - 25th Anniversary Collectors Set.
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