- Akritirian maximum security detention facility
- Akros
- Akrumba
- Aksani
- Aksani system
- Akspra
- Aktaj
- Aktuh
- Aktuh and Maylota
- Aku Sale
- Akula
- Akula class (destroyer/escort)
- Akula class (frigate/destroyer)
- Akula class (submarine)
- Akuta
- Akwar's Ninth Prophecy
- Akwood's syndrome
- Al'Hmatti
- Al's Intergalactic Bar & Grill Shoppe
- Al'yans
- Al'yans I
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- Al-Biruni
- Al-Jazaar
- Al-Leyan
- Al-Leyan transport
- Al-Rashan
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- Al-Stakna Mountains
- Al Rashid
- Al Rijil
- Alabama
- Alabama (cadet)
- Alabama (disambiguation)
- Alabaster
- Alabaster I
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- Alacti
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- Alain Reynolds
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- Alajian
- Alak
- Alak IV
- Alakon
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- Alamedus
- Alamenta
- Alamenta II
- Alamo
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- Alamo (starship)
- Alan
- Alan-a-Dale
- Alan (disambiguation)
- Alan B. Shephard Dome
- Alan Becker
- Alan Bernard (Doctor)
- Alan Bernard (Lieutenant Commander)
- Alan Dean Foster
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- Alara Rogers
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- Alariin
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- Alaris system
- Alarm
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- Alasho
- Alaska
- Alaska (disambiguation)
- Alaska class
- Alastor
- Alastria
- Alastron
- Alastron IV
- Alata
- Alatum
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- Alavor Ment
- Albali
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- Albany Times-Union
- Albar Exar
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- Albatross (starship)
- Albegad
- Albemarle
- Albers
- Albert
- Albert (disambiguation)
- Albert Barnaby
- Albert Chesterfield
- Albert Clayton
- Albert Einstein
- Albert Macklin
- Albert Schang
- Albert Sims
- Albert Tucker
- Alberta Crill
- Alberto
- Alberto (disambiguation)
- Alberto Giolitti
- Alberto Gomez
- Alberto Natale
- Alberto Taveras
- Albertson
- Albertson (20th century)
- Albertson (22nd century)
- Albinism
- Albino
- Albino fangcat
- Albireo II
- Alborian
- Albrek
- Albuquerque
- Alca
- Alcatraz
- Alcatraz Children's Park
- Alcawell
- Alchemy
- Alchibah
- Alcohol
- Alcor
- Alcyone
- Alcyone (disambiguation)
- Alcyone II
- Aldany Menzies
- Aldara (mirror)
- Aldea
- Aldea Prime
- Aldea Prime Shipyard
- Aldean
- Aldebaran
- Aldebaran (disambiguation)
- Aldebaran 1
- Aldebaran III
- Aldebaran Magnus V
- Aldebaran depth charge
- Aldebaran native
- Aldebaran sea bass
- Aldebaran sector
- Aldebaran serpent
- Aldebaran shellmouth
- Aldebaran whiskey
- Aldebaran wine
- Alden Allard
- Alden McWilliams
- Alderaan
- Alderam
- Alderam III
- Alderi
- Alderi III
- Aldhan
- Aldo Corsi
- Aldo Erdona
- Aldora Vint
- Aldos II science station
- Aldous
- Aldrich Chang (23rd century)
- Aldrich Chang (24th century)
- Aldrin
- Aldrin City Archives Annex
- Aldus Prime
- Aldys
- Ale
- Alec
- Alec MacPherson
- Aleco Vel
- Aledo (disambiguation)
- Aleek-Aur
- Aleira
- Alejandro Montenegro
- Alela
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- Alemir Bahrkandi
- Alenar
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- Alennic Gomorrac
- Aleph
- Aleph (aide)
- Aleph III
- Aleph Prime
- Aleph system
- Alephan
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- Alerica
- Alert status
- Alesian
- Aleta Shabalala
- Aleutian Islands
- Alex
- Alex (disambiguation)
- Alex Boughamer
- Alex Bowen (23rd century)
- Alex Bowen (24th century)
- Alex Chhung
- Alex Danaher
- Alex Dumant
- Alex Gaeta
- Alex Gardner
- Alex Kurtzman
- Alex Kurtzman (Starfleet)
- Alex Russ
- Alex Tatopolous
- Alex Terapane
- Alex White
- Alexander
- Alexander's bird-of-prey
- Alexander (dog)
- Alexander (mirror)
- Alexander Baker
- Alexander Dylan Glideman-Adler
- Alexander Enberg
- Alexander Erickson
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- Alexander Jefferson
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- Alexander Llorente
- Alexander Marcus
- Alexander Marcus (Kelvin timeline)
- Alexander Munro
- Alexander Pavlov
- Alexander Rozhenko
- Alexander Siddig
- Alexander Simmons
- Alexander Soloviev
- Alexander of Platonius
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- Alexandra
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- Alexandre Dumas
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- Alexandria
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- Alexandria II
- Alexandria Munro
- Alexei
- Alexei Chernin
- Alexey Leonov
- Alexis
- Alexis Kindr
- Alexis Osman
- Alexisian
- Aleyda
- Aleyni Cam
- Alfa 177
- Alfa 177 canine
- Alfa Effect
- Alfacite
- Alfacite Energy Phenomenon
- Alfarian
- Alfarian hair pasta
- Alfas Ducat
- Alfas Ducat (planet)
- Alfear Yorgas
- Alferaz A
- Alfgan
- Alfin-Bernard
- Alfonse Pacelli
- Alfonzo
- Alfonzo (USS Enterprise-C)
- Alfonzo (USS Mercury)
- Alfor
- Alfr
- Alfred (disambiguation)
- Alfred Bleikoff
- Alfred Bowles
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- Alfred Nobel
- Alfred North Whitehead
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- Alfredo Pedillo Jose
- Alfvén wave
- Algae
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- Algerida
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- Algeron III
- Algeron IV
- Algira sector
- Algobarium
- Algol
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- Algol I
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- Algol Prime
- Algolian
- Algolian ceremonial music
- Algor
- Algorab
- Algorian
- Algorian mammoth
- Alhambra (disambiguation)
- Alhamisi Uhura
- Alhan Jago
- Alhara
- Alhena
- Alhena Station
- Alhena al-Khaled
- Alhouan
- Ali Baba (entertainer)
- Ali Harper
- Ali Ries
- Alice