- "8-bit" Metroid Key Chain
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- 'Project Golem' Game Trailer
- 03 (Disambiguation)
- 03 Bay
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- 07th Platoon
- 101% glitch
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- 1LT W. Smythe
- 2466 URSA
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- 4-2DASSYUT
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- A Piercing Screech
- A Sinister Laboratory
- Aaron (Disambiguation)
- Aaron Thomas
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- Abandoned (Disambiguation)
- Abandoned Base
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- Ability Disassembly and Conversion Device
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- Adrian Barritt
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- Aether Lab Entryway
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- Alberto Camarasa Cámara
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- Alden Phipps
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- Alex Leung
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- Aliehs III
- Alimbic
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- Alimbic Artifact
- Alimbic Cannon
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- Alinos
- Alinos (theme)
- Alinos Gateway
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- Alinos Perch
- Alpha's chamber
- Alpha (Disambiguation)
- Alpha Blogg
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- Alésia Glidewell
- Amanda (Disambiguation)
- Amanda Rotella
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- Amiibo
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- Ammo Station
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- Ammolite and Witherite Shards
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- Amokmaw
- Amorbis
- Amorbis (theme)
- Amplification beam
- Amtti VI
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- An Unfortunate Discovery
- Ana Paris
- Ancient Bion race
- Ancient Chozo Robot
- Ancient Chozo Ruins
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- Ancient Courtyard
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- Ander Alzola Angulo
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- Andest I
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- Andrew Estes
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- Android
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- Anhur-class patrol ship
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- Another Metroid 2 Remake
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- Another Side Story
- Antechamber
- Anthony (Disambiguation)
- Anthony Higgs
- Anthony Iammarino
- Anti-Air Cannon "Tiamat"
- Anti-Phazon Unit
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- Anxo Sotelo Pérez
- Any objections, Lady?
- Aoki (Disambiguation)
- Apex Screw Attack
- Appearance Fanfare~Brinstar (Disambiguation)
- Approaching Sector Zero
- Apronika (Disambiguation)
- Aqua Drone
- Aqua Pirate
- Aqua Reaper
- Aqua Sac
- Aqua Zebesian
- Arachnus
- Arachnus' chamber
- Arachnus' room
- Aran (Disambiguation)
- Arbor Chamber
- Arboretum
- Arboretum Access
- Architect
- Arcing-fireball attack
- Arcterra
- Arcterra Gateway
- Arcterra Gateway (theme)
- Arctherus
- Arctic Spawn
- Ardis system
- Area1 Add1
- Area2 Add1
- Area2 Basic
- Area4 5 Basic
- Area 1
- Area 1 (theme)
- Area 2
- Area 3
- Area 4
- Area 4 (theme)
- Area 5
- Area 6
- Area 6 (theme)
- Area 7
- Area 8
- Area 8 (theme)
- Area 8 Ruins
- Area Indefinite
- Arena 5
- Arena area of Chozo base
- Ariadne Yuko
- Aric Norine
- Ariel del Rio de Angelis
- Arielle Walter
- Aries-class transport
- Arigat and Asian Philharmonic Orchestras
- Arisa Yanagi
- Arkithun
- Arm Cannon
- Arm pumping
- Armaged Pantheon
- Armored Aerotrooper
- Armored Bot
- Armored Pirate
- Armored security lock
- Armstrong Houston
- Arne Glinka
- Arne Jödicke
- Arnie Myers
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- Arrival Station
- Arthur Geraerts
- Artifact (Disambiguation)
- Artifact Shield
- Artifact Shrine (Release of the Chozo Ruins Seal)
- Artifact Temple
- Artifact Temple (Pinball)
- Artifact of Chozo
- Artifact of Elder
- Artifact of Lifegiver
- Artifact of Nature
- Artifact of Newborn
- Artifact of Spirit
- Artifact of Strength
- Artifact of Sun
- Artifact of Truth
- Artifact of Warrior
- Artifact of Wild
- Artifact of World
- Artificial Intelligence
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