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- A Warp in Space! (Comic)
- A World Against Itself! (Comic)
- A World Gone Mad (Comic)
- Aak'Torr (SFC)
- Aakam (STO)
- Aakar (STO)
- Aakenn class (FASA)
- Aaron Baiers
- Aaron Harberts
- Aaron Harvey
- Abel Niwen (FASA)
- Ablative armor
- Abraham Lincoln
- Abraham Sofaer
- Abrahamic faiths
- Abrams
- Abyss Station (STA)
- Accersitus (SFC)
- Achilles
- Achilles (23rd Century)
- Achilles heel
- Adam
- Adam (Biblical)
- Adam Roarke
- Adar (STO)
- Adashake Center
- Addison Johnston
- Admiral
- Admiral Archer (Kelvin)
- Adolf Hitler
- Adolf Hitler (Myriad)
- Adrian Spies
- Adrienne Iu
- Adrift (STA)
- Adrokos (SFC)
- Aerie class (LUG)
- Age of Discovery (STO)
- Agents of Yesterday (STO)
- Agincourt
- Agmar
- Ahwahnee
- Air Force Captain (TOS21)
- Air Police Sergeant
- Air Policeman
- Airlock Technician
- Ajax
- Akaali ship
- Aki Yun Lee
- Akira class
- Akiva Goldsman
- Akros (SFC)
- Akula class (SFC)
- Alan Dean Foster
- Alanna Train
- Alastair Sew Hoy
- Albatross (Episode)
- Albert Einstein
- Albireo (FASA)
- Albrek (SFC)
- Aldebaran Colony
- Aldebaran III (FASA)
- Aldebaran shellmouths
- Aldebaran system
- Aldebaran system (FASA)
- Alden
- Aldrich Chang (SFC)
- Aleek-Om
- Aleriad (FASA)
- Alex Bowen (SFC)
- Alex Gardner (First Splinter)
- Alex King
- Alex Kurtzman
- Alexander Courage
- Alexander Hamilton
- Alexander Phan
- Alexander Siddig
- Alexandre Dumas
- Alexandre Pelletier
- Alfa 177
- Alfa 177 (FASA)
- Alfa 177 canines
- Alfred Ryder
- Algeron III (First Splinter)
- Algira Sector
- Ali Hassan
- Alice's Adventures in Wonderland
- Alice (Fictional)
- Alice Rawlings
- Aliens (Decipher)
- Alison McLeod
- All Our Yesterdays (Episode)
- All Our Yesterdays (LUG)
- All Those Who Wander (Episode)
- Allan Douglas Parker
- Alleycat class (SFC)
- Allies (STO)
- Almatha Sector
- Alnitak system
- Alonis
- Alpha Canaris system (FASA)
- Alpha Carinae II
- Alpha Centauri
- Alpha Centauri (FASA)
- Alpha Centauri (Myriad)
- Alpha Centauri Sector
- Alpha Centauri system
- Alpha Centauri system (FASA)
- Alpha Centauri system (Myriad)
- Alpha III
- Alpha III (FASA)
- Alpha Leonis system
- Alpha Leonis system (FASA)
- Alpha Majoris II (FASA)
- Alpha Proxima II (FASA)
- Alpha Quadrant Sourcebook (STA)
- Altair III
- Altair IV
- Altair IV (FASA)
- Altair VI
- Altair VI (FASA)
- Altair class
- Altair system
- Altair system (FASA)
- Althouse (First Splinter)
- Alyssa Alvarado
- Alyssa Feller
- Alyssa Hickman (SFC)
- Amanda Grayson
- Amanda Grayson (FASA)
- Amanda Grayson (Kelvin)
- Amanda Grayson (Myriad)
- Amanda Turnage
- Amar Singh (STO)
- Amazon University
- Ambassador class
- Amber (FASA)
- Amber Wood (SFC)
- American Continent Institute
- American Continent Institute (FASA)
- American Revolution
- Amerind (FASA)
- Amina Ramsey
- Amna Patel (STO)
- Amok Time (Episode)
- Among the Clans (LUG)
- Amrasaur (SFC)
- Amy Fleming (SFC)
- Anabesh (SFC)
- Anaconda class (SFC)
- Analest (First Splinter)
- Anamika Baruah
- Anan 7
- Anaria (SFC)
- Ancestral Sin (STO)
- Anchor (FASA)
- And a Child Shall Lead Them! (Comic)
- And the Children Shall Lead (Episode)
- Andell (First Splinter)
- Andor (FASA)
- Andor class (FASA)
- Andoria
- Andorian Sector
- Andorians
- Andorians (Columbia)
- Andorians (FASA)
- Andre Emerson
- Andrea
- Andrea Dromm
- Andrei (STO)
- Andrei Chekov
- Andrei Chekov (FASA)
- Andrei Chekov (Kelvin)
- Andres Espinosa
- Andrew Peregrine
- Andrew Stiles
- Andrius (SFC)
- Andromeda
- Andromeda class
- Andromeda galaxy
- Andros Taksulus (SFC)
- Andy Billups
- Andy Velasquez
- Angel One (Episode)
- Angela Cheng
- Angela Martine
- Angela Martine (FASA)
- Angela Martine (SNW10)
- Angela Sung
- Angela Teller
- Angela V. Llerena
- Angorseer Mountain (First Splinter)
- Anij
- Anka Do
- Ann Kim
- Anne Potter (STO)
- Anne Todd (SFC)
- Anomalies (STA)
- Anomaly (Episode)
- Another Roll of the Dice (STA)
- Antares
- Antares (FASA)
- Antares type
- Anthony
- Anthony Call
- Anthony Jennings
- Anthony Montgomery
- Anthony Stocker (SFC)
- Anthony Wright (STO)
- Anton Betz (SFC)
- Anton Schaefer (STO)
- Anton Yelchin
- Anton class (FASA)
- Antonio Caggiano
- Antos IV (FASA)
- Antosians (FASA)
- Anwol Kaht (First Splinter)
- Anxo Rogeiro (First Splinter)
- Apache class (FASA)
- Apache class (SFC)
- Aplithin (FASA)
- Apollo class
- Apollo class (Legacy)
- Apollo program
- Arch Whiting
- Archanis Sector
- Archanis system
- Archanis system (FASA)
- Archer
- Archer class (Columbia)
- Archons
- Arcturus
- Arcturus IV (FASA)
- Arcturus system (FASA)
- Ardak Kumerian (SFC)
- Areel Shaw
- Arena (Episode)
- Argona II
- Arinius Domaric (SFC)
- Arlene Martel
- Armin Shimerman
- Armstrong
- Arnold Lessing
- Arnold Moss
- Aron Eisenberg
- Arrogance (SFC)
- Artamer Ter Mak-B (First Splinter)
- Artemis Trium (SFC)
- Arthur Conan Doyle
- Arthur Jones (SFC)
- Arucanis Arm (STO)
- Asarem Wadeen (First Splinter)
- Asher Moss (STO)
- Assignment: Earth (Episode)
- Assimilation of the Innocent (STO)
- Assist class (FASA)
- Assistant Engineer (TOS20)
- Atlantis NX-05 (Columbia)
- Atlantis NX-05 (UFP150)
- Atugn (FASA)
- Aulia (FASA)
- Aurelan Kirk
- Aurelan Kirk (KLVX)
- Autarch
- Avali (FASA)
- Avenger NX-09 (Legacy)
- Aventeur class (FASA)
- Avery Bessent (SFC)
- Avery Brooks
- Avian Captive (TOS01)
- Aviel Mann Ballo
- Axanar
- Axanar (FASA)
- Ayelborne
- Ayelborne (FASA)
- Aztral Tzel Tov-B (First Splinter)
- B'Aileer (SFC)
- B'Elzebub (SFC)
- B'Etor
- B'Jinn (SFC)
- B'nie (SFC)
- B'rel class (STO)
- B-10 class (SFC)
- B-11 class (SFC)
- Babcock class (FASA)
- Babel (STO)
- Bacchus' Irresistible Call (STA)
- Back to Reality (STA)
- Bader class (FASA)
- Bailiff (TOS15)
- Bajor Sector
- Baker class (FASA)
- Balance of Terror (Episode)
- Balok
- Balok (FASA)
- Barathrum Caries (SFC)
- Barbara Anderson
- Barbara Babcock
- Barbara Baldavin
- Barbarian (SFC)
- Barca (SFC)
- Barnes
- Barnetta Fowler
- Barnhart
- Barnhart (FASA)
- Baron class (SFC)
- Barry Atwater
- Barry J. Kelly
- Barry Russo
- Barry Trivers
- Barstow
- Bart Conrad
- Bartell La Rue
- Baruch Spinoza
- Baton Rouge class (FASA)
- Baton Rouge class (Myriad)
- Battle Claw (SFC)
- Battle at the Binary Stars (Episode)
- Battle at the Binary Stars (TFO) (STO)
- Battle of Axanar (FASA)
- Battle of Caleb IV (STO)
- Battle of Cheron
- Battle of Cheron (FASA)
- Battle of Cheron (UFP150)
- Battle of Chin'toka
- Battle of Gamma Hydra (FASA)
- Battle of Prantares (FASA)
- Battle of Vulcan (KLVX)
- Battle of Vulcan (Kelvin)
- Battlehawk class (SFC)
- Beauregard
- Beckett Mariner
- Becky Bellavia
- Before the Common Era
- Before the Common Era (Columbia)
- Bel Oh
- Bell Fulsome (SFC)
- Beloti Sector
- Bem (Episode)
- Ben Childress
- Ben Cross
- Ben Finney
- Ben Finney (FASA)
- Ben Finney (LUGM)
- Ben Joseph
- Ben Kalina