- "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
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- A Piercing Screech
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- Aaron (Disambiguation)
- Aaron Thomas
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- 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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- Alex Leung
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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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- Amanda (Disambiguation)
- Amanda Rotella
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- Amiibo
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- Amorbis
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- Amplification beam
- Amtti VI
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- An Unfortunate Discovery
- Ana Paris
- Ancient Bion race
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- Andrew Estes
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- Android
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- Another Metroid 2 Remake
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- 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
- Apex launcher shaft
- 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
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- Arctherus
- Arctic Spawn
- Ardis system
- Area1 Add1
- Area2 Add1
- Area2 Basic
- Area4 5 Basic
- Area 1
- Area 1 (theme)
- Area 2
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- Area 4
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- Area 5
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- Area 7
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- Area 8 (theme)
- Area 8 Ruins
- Area Indefinite
- Arena 5
- Arena area of Chozo base
- Ariadne Yuko
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- Ariel del Rio de Angelis
- Arielle Walter
- Aries-class transport
- Arigat and Asian Philharmonic Orchestras
- Arisa Yanagi
- Arkithun
- Arm Cannon
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- Armored security lock
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- Arthur Geraerts
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- Artifact Shield
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- 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
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