- 101st Regiment
- 104th Battalion
- 125th Legion
- 147th Tactical Fleet
- 16th Precinct
- 181st Armor Division
- 187th Battalion
- 187th Legion
- 208
- 212th Attack Battalion
- 212th Recon Division
- 21st Nova Corps
- 240th Regiment
- 282nd Star Corps
- 302nd Division
- 313th Battalion
- 31st Legion
- 327th Star Corps
- 332nd Company
- 332nd Division
- 38 Minutes (Continues Era episode)
- 38 Minutes (TNG Era episode)
- 3rd Brigade
- 41st Elite Corps
- 41st Ranger Platoon
- 41st Scout Battalion
- 42nd Assault Squad
- 442nd Siege Battalion
- 4th Sector Army
- 501st Legion
- 52nd Sky Corps
- 5th Fleet Security
- 602 Club
- 75542
- 7th Legion
- 7th Sky Corps
- 827th Attack Battalion
- 87th Sentinel Corps
- 88th Star Corps
- 91st Mobile Reconnaissance Corps
- 96th Legion
- 986th forest assault battalion
- 99th Elite Legion
- 9th Assault Corps
- A-300 phaser rifle
- A-M18A1 Claymore mine
- A-class (32nd century)
- A.R.G.U.S.
- A.R.G.U.S. (Earth-Prime)
- A.R.G.U.S. headquarters
- A.R.G.U.S. headquarters (Earth-Prime)
- A.T.O.M. Exosuit
- A.T.O.M. Exosuit (Earth-Prime)
- A/SF-01 starfighter
- A280-CFE sniper rifle
- AAL-2100/9.5 atmospheric assault lander
- AG-3 satellite
- ARC-1
- ARC-100
- ARC-2
- ARC-3
- ARC-77
- ARC-9999
- ARC trooper armor
- A Aunt In Trouble
- A Broken Place (SNW Era episode)
- A Call To Arms (TNG Era episode)
- A Complicated Situation (TNG Era episode)
- A Complicated Situation (TOS Era episode)
- A Cry for Help
- A Cry for Help from across the Multiverse
- A Deadly Threat Rises
- A Death in the Family
- A Desperate Rescue
- A Friend Kidnapped
- A Friend and Daughter Visit
- A Gift
- A Matter of Honor (SNW Era episode)
- A Matter of Honor (TNG Era episode)
- A Missing Friend
- A New Assignment (TNG episode)
- A New Empire
- A New Mission
- A Old Friend Calls
- A Secret Discovered
- A Senator Returns
- A Time to Stand (TNG Era episode)
- A Tragedy
- A Tragedy (TNG Era episode)
- A Tragedy (TOS Era episode)
- A Trip into the 32nd century
- A Unwelcome Situation
- Aaron Cavit (AMU)
- Aaron Cross
- Aayla Secura
- Abigail Sciuto
- Abigail Williams
- Ablative armor
- Ablative generator
- Abraham Ellis
- Abronath
- Abydos Mission
- Abydos team
- Acastus Kolya's capture of John Sheppard
- Acclamator I-class assault ship
- Acclamator II-class assault ship
- Acheron (LV-426)
- Acheron class (31st century)
- Achilles class
- Acon class (V'draysh)
- Acrata suit
- Act 1/Attack
- Act 1/Determining the disappearance of colonies
- Act 2/Encountering a derelict vessel
- Act 2/Reinforcements arrived
- Act 2/Tense Situation
- Act 3/Stand down
- Act 4/Stopping energy burst
- Active tracker
- Adam Brody
- Adam Mitchell
- Adam Ryan
- Adamant class
- Adi Gallia
- Admah
- Administrators and Chat Moderators
- Admiral
- Admiral Adama In Trouble
- Adria Kidnapped
- Adria Mal Doran
- Adrian Chase
- Adrian Chase's bow
- Adrian Chase (Earth-2)
- Adrian Chase (Earth-98)
- Adrian Chase (Earth 87)
- Adrian Chase (Earth Fifty One)
- Advanced City-ship
- Advanced Recon Commando
- Advanced Recon Force trooper
- Advanced Viper Mark II
- Advanced Viper Mark III
- Advanced Zero Point Module
- Aegis class (23rd century)
- Aenar
- Aenar class (29th century)
- Aeon class (29th century)
- Aeroshuttle
- Aerowing class (31st century)
- Affair
- Afsarah Eden
- Aftermath (TNG Era episode)
- Aftermath of the Anti-Monitor Crisis
- Against Orders
- Agents of SSR
- Agonizer
- Ahsoka Tano
- Aimee Wessling
- Akira class
- Akira class (31st century)
- Akira class (32nd century)
- Akira class (Asgard-type)
- Akira class (V'draysh)
- Akolo Tare
- Alara Kitan
- Albert Calavicci
- Alcatraz class (22nd century)
- Alea Illacta Est (Continues Era episode)
- Alea Illacta Est (SNW Era episode)
- Alea Illacta Est (TNG episode)
- Alea Illacta Est (TOS Era episode)
- Alea Illacta Est (TOS episode)
- Alena Whitlock
- Alena Whitlock (Earth 87)
- Alex
- Alex Danvers
- Alex Danvers' alien gun
- Alex Danvers' apartment
- Alex Danvers' apartment (Earth-38)
- Alex Danvers' apartment (Earth-Prime)
- Alex Danvers's suit
- Alex Danvers (Earth 92)
- Alex Danvers (Earth Thirty-Eight)
- Alex Faust (Earth 87)
- Alex Meyers
- Alexa Crowe
- Alexander Honigsberg (AMU)
- Alexander Marcus
- Alexander Marcus (alternate reality)
- Alexander Munro
- Alexander Pierce
- Alexandra Cabot
- Alexandra Eames
- Alexandra Udinov
- Alexandria Munro
- Alexis Los Alamos
- Alfred Bester
- Alfred Pennyworth
- Alice class (32nd century)
- Alicia Vega
- Alien fighter
- Alien ship
- Alison Meyers
- Alison Mitchell
- Alison Porter
- All Hell Breaks Loose
- Allegiance class
- Alliance-Federation War
- Alliance (2154)
- Alliance Attack
- Alliance Intelligence
- Alliance Nor
- Alliance of Four Great Races
- Alliances (TNG Era episode)
- Allison Blake Carter
- Allison Roberts
- Alone
- Alpha-19
- Alpha-class Advanced Recon Commando
- Alpha 210
- Alpha 373
- Alpha 821
- Alpha 822
- Alpha Company
- Alpha Site
- Alpha Site (Andromeda episode)
- Alpha Site (Luna episode)
- Alpha Site (Second)
- Alpha Site (episode)
- Alphonso Mackenzie
- Altamid
- Alteran
- Alteran Home Galaxy
- Alteran division
- Alterius Sexus universe
- Alternate Consequences
- Alternate Lives, Talia al Ghul is my Wife
- Alternate Mirror Invasion
- Alternate mirror universe
- Alternate reality
- Alternate reality (Alti)
- Alternate reality (Nero, 2233)
- Alternate reality (mirror Nero, 2233)
- Alternate reality drive
- Alternate reality mirror universe
- Alternate timeline (alternate future)
- Alternate universe
- Alternative Weapon System
- Alti (alternate reality)
- Alucard Dracul
- Alynna Nechayev
- Alyssa O'Neill
- Aman Evek
- Amanda Cole (alternate)
- Amanda Collins
- Amanda Davis
- Amanda Peterson
- Amanda Ripley
- Amanda Roberts
- Amanda Rollins
- Amanda Tapping
- Amanda Waller
- Amanda Waller (Earth-51)
- Amar
- Amarcan class
- Amarice (clone)
- Amaterasu
- Amaya Jiwe
- Amazon
- Amazon Elite archers
- Amazon Nation
- Amazon Queen
- Amazon Royal Challenge
- Amazon archers
- Amazon personal guard
- Amazons
- Ambassador's Gambit (Continues Era episode)
- Ambassador's Gambit (TNG Relaunch Era episode)
- Ambassador class
- Ambassador class (V'draysh)
- Amber
- Ambush of Kresh'ta
- Ambush outside of the Sanctuary
- Amilyn Holdo
- Amoria (clone)
- Amy Johnson
- Amy Morris
- Amy Roberts
- Amy Wellington
- An Ancient Discovery
- Anansi Totem
- Anara Kahn
- Anastasia Dee Dualla
- Ancient
- Ancient Technology Activation gene
- Ancient Technology Activation gene therapy
- Ancient beam transporter
- Ancient environmental suit
- Ancient fleet
- Ancient outpost
- Ancient shield
- Ancient shuttle
- Andor
- Andor (AMU)
- Andor (mirror)
- Andorian
- Andorian (AMU)
- Andorian (DMU)
- Andorian (mirror)
- Andorian Defense Force
- Andorian Empire
- Andorian Empire (DMU)
- Andorian Guard
- Andorian Imperial Guard
- Andorian Rebellion
- Andorian Reserve Fleet
- Andorian rifle
- Andrea Rojas (Earth-88)
- Andromeda Season 1
- Andromeda Season 2
- Andromeda Season 3
- Andromeda class (26th century)
- Andrus Hagan
- Angela Clarke
- Angela Roberts
- Angelo Tassoni
- Angelynne Parker
- Anise
- Anna Jameson
- Anne Hathaway
- Anne Teldy
- Annika Hansen (AMU)
- Annika Hansen (PAMU)
- Annika Hansen (RMU)
- Annika Hansen (alternate timeline)
- Annika Hansen (mirror)
- Another Life
- Another Time, Another Place (TNG Era episode)
- Another Time, Another Place (TOS Era episode)
- Antarctic Treaty
- Antares class (Starfleet)
- Antares class (freighter)
- Anthony DiNozzo
- Anti-Replicator gun
- Anti-Terran Rebellion
- Antimatter