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- Aaron Thomas
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- Alinos
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- Alpha's chamber
- Alpha (Disambiguation)
- Alpha Blogg
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- Amanda Rotella
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- Anthony (Disambiguation)
- Anthony Higgs
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- Anti-Air Cannon "Tiamat"
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- Any objections, Lady?
- Aoki (Disambiguation)
- Apex Screw Attack
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- Appearance Fanfare~Brinstar (Disambiguation)
- Approaching Sector Zero
- Apronika (Disambiguation)
- Aqua Drone
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- Arachnus
- Arachnus' chamber
- Arachnus' room
- Aran (Disambiguation)
- Arbor Chamber
- Arboretum
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- Architect
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- Arcterra
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- Area1 Add1
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- Area2 Basic
- Area4 5 Basic
- Area 1
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- Area 8 Ruins
- Area Indefinite
- Arena 5
- Arena area of Chozo base
- Ariadne Yuko
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- Arisa Yanagi
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- Armored security lock
- Armstrong Houston
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- Arthur Geraerts
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- Artifact Shield
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- 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
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