- "8-bit" Metroid Key Chain
- "Dragoon" Battle Drone
- "Humility" Class Turret
- "Jolly Roger" Drone
- "King Conan"
- "Shrike" Class Assault Skiff
- "Vigilance" Class Turret
- 'Big Time' Brannigan
- 'Project Golem' Game Trailer
- 03 Bay
- 07th Platoon
- 101% glitch
- 18 (Disambiguation)
- 1LT W. Smythe
- 2466 URSA
- 3DS Metroid game
- 3rd Division of the Federation Space Army
- 4-2DASSYUT
- A-Kul
- A-Kul's Clues
- A-Voq
- AI Combat Drone
- AUX Ammo Replicator
- AUX Amplifier
- AUX ammo
- AU Status Screen
- A Piercing Screech
- A Sinister Laboratory
- Aaron (Disambiguation)
- Aaron Thomas
- Aaron Walker
- Aaron de Orive
- Aazelion
- Aazim Khan
- Abandoned (Disambiguation)
- Abandoned Base
- Abandoned Ship
- Abandoned Worksite
- Abandoned factory site
- Abe (Disambiguation)
- Ability Disassembly and Conversion Device
- Ablative armor
- Abraham Pérez
- Accel Charge
- Access Code
- Access ramp
- Accursed Lake
- Acid
- Acid-filled runway
- Acid (Disambiguation)
- Acid Rain
- Acid Worm
- Acid Worm's room
- Acid fall
- Acidic concourse
- Action Movie
- Action Staffers
- Action Story
- Adad Morales
- Adam's helmet
- Adam (Disambiguation)
- Adam Barenblat
- Adam Crabb
- Adam Munton
- Adrenaline
- Adrian (Disambiguation)
- Adrian Barritt
- Adrian David Enciso
- Adrian Michalski
- Adrian Page
- Adriano Antonini
- Adult and Child Modes
- Advanced Aerotrooper
- Advanced Weapon Training
- Adventure Mode: The Subspace Emissary
- Adventure Mode (Disambiguation)
- Adventure Mode (Melee)
- Adventure Mode (Metroid Prime Hunters)
- Aeion
- Aeion Ability Artifact
- Aeion Ability disruptor field
- Aeion Gauge
- Aeion Orb
- Aeion Tank
- Aerial Repair Drone
- Aerial Training Site
- Aerie
- Aerie Access
- Aerie Transport Station
- Aeromine
- Aerotrooper-G
- Aether
- Aether (Disambiguation)
- Aether Lab Entryway
- Aether incident
- Affinity Weapon
- Afloraltite
- Agon Bearerpod
- Agon Energy Controller
- Agon Map Station
- Agon Temple
- Agon Transport Access (Disambiguation)
- Agon Transport Access (Sanctuary Fortress)
- Agon Transport Access (Temple Grounds)
- Agon Wastes
- Agon Wastes (theme)
- Agricultural world
- Ai Kobayashi
- Ainhoa Bernad Hurtado
- Air-purification system
- Air Hole
- Air Lock
- Air of Dark Aether
- Airport / Internet
- Airshaft
- Airthorn
- Akemi Hirota
- Aki Sakurai
- Akihiro Nakamura
- Akihiro Sakatani
- Akiko (Disambiguation)
- Akiko Furukawa-Laban
- Akiko Isobe
- Akiko Miyano
- Akintunde Omitowoju
- Akira (Disambiguation)
- Akira Fujiwara
- Akira Hirabayashi
- Akira Kinashi
- Akira Oishi
- Akira Otani
- Akira Taguchi
- Akiya Sakamoto
- Al Artus
- Alain Schneuwly
- Alan Diekfuss
- Albert Chau
- Alberto (Disambiguation)
- Alberto Camarasa Cámara
- Alberto Fernández Vázquez
- Alcoon
- Alcove
- Alcove (Disambiguation)
- Alden Phipps
- Aleix Garrido Oberink
- Alejandro Roura
- Aleksandar Stefanovic
- Alessandro Tardito
- Alessio Danieli
- Alex (Disambiguation)
- Alex Leung
- Alex MacFarlane
- Alex Proyas
- Alex Quinones
- Alexander Kuhl
- Alexander Van Berg
- Alfonso Acuña Moreno
- Alfonso Valladolid Ferrández
- Aliehs III
- Alimbic
- Alimbic (language)
- Alimbic Artifact
- Alimbic Cannon
- Alimbic Cannon Control Room
- Alimbic Cluster
- Alimbic Datashade
- Alimbic Gardens
- Alimbic Joist
- Alimbic Order of Elders
- Alimbic Panel
- Alimbic Prophecy
- Alimbic Turret
- Alimbic insignia
- Alimbic scholars, scientists, and historians
- Alimbic scripts
- Alinos
- Alinos (theme)
- Alinos Gateway
- Alinos Gateway (theme)
- Alinos Perch
- Alpha's chamber
- Alpha (Disambiguation)
- Alpha Blogg
- Alpha Hopper
- Alpha Metroid
- Alpha Metroid and Samus cake
- Alpha Metroid chamber
- Alpha Power Bomb Room
- Alpha Sandigger
- Alpha Splinter
- Alphonse Du
- Alt-Form
- Altair V
- Altar of Judgment
- Alternate costume
- Alvaro García Arredondo
- Alésia Glidewell
- Amanda (Disambiguation)
- Amanda Rotella
- Amanda Rubright
- Amiibo
- Ammo Gauge
- Ammo Station
- Ammo Station (Dark Torvus Bog)
- Ammolite and Witherite Shards
- Amok Mommy
- Amokmaw
- Amorbis
- Amorbis (theme)
- Amplification beam
- Amtti VI
- Amtti VII
- An Unfortunate Discovery
- Ana Paris
- Ancient Bion race
- Ancient Chozo Robot
- Ancient Chozo Ruins
- Ancient Chozo machine
- Ancient Courtyard
- Ancient Ruin
- Ancient Vestige
- Ancient skiff
- Ander Alzola Angulo
- Ander Amo del Ser
- Anders Bergman
- Andest I
- Andre Marentette
- Andrea De Benedetto
- Andrea Salvi
- Andreas Langer
- Andrew (Disambiguation)
- Andrew Estes
- Andrew Jones
- Android
- Andy Fey
- Andy Hanson
- Andy O'Neil
- Andy Schwalenberg
- Angela Jeong
- Anglyyn
- Angstrom Analogue Radio Mapping Array
- Angus Mackay
- Anhur-class patrol ship
- Animal Crossing
- Animal Logic
- Animus
- Animworm
- Ann Linn
- Anne-Marie Laperriere
- Annihilator Beam
- Another Metroid 2 Remake
- Another Metroid 2 Remake/Credits
- Another Metroid 2 Remake/Items
- Another Metroid 2 Remake/Log Book
- Another Side Story
- Antechamber
- Anthony (Disambiguation)
- Anthony Higgs
- Anthony Iammarino
- Anti-Air Cannon "Tiamat"
- Anti-Phazon Unit
- Anti-gravity
- 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
- 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
- Arrate Ugarte Sandonis
- Arrival Station
- Artaria
- 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
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