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- Aparecium (Trading Card)
- Ape
- Apolar
- Apolline Delacour
- Apolline Delacour's mother
- Apollonia Black
- Apollonia Black's Journal
- Apollonia Black's grotto
- Apollyon Pringle
- Apostrophe
- Apothecarium Lemus
- Apothecarium of Horace E. F. Slughorn
- Apothecary
- Apothecary (Trading Card)
- Apothecary (disambiguation)
- Apothecary department
- Apothecary shopkeeper
- Appalachian Mountains
- Appaloosa Puffskein
- Apparate (Trading Card)
- Apparition
- Apparition (class)
- Apparition (spirit)
- Apparition Examiner
- Apparition Instructor
- Apparition Law
- Apparition Test Centre
- Appeal Against House-Elf Slavery
- Apple
- Apple & red currant tart
- Apple (Common Welsh Green)
- Apple (fruit)
- Apple (tree)
- Apple Brook
- Apple Rings
- Apple and dragon heartstring wand
- Apple juice
- Apple pie
- Apple tart
- Appleby
- Appleby Arrows
- Appleby Arrows vs Wimbourne Wasps match
- Applewood and dragon heartstring wand
- Approval for Whipping
- Apricot
- April
- April Fools' Day
- April Hughes
- April Kelley
- Aqua-Lung
- Aqua Eructo
- Aqua Eructo Duo
- Aqua Eructo spellbook
- Aqua Vitæ
- Aquarius
- Aquatic Wonders of Yorkshire: A Wizard's Field Guide
- Aquavirius Maggot
- Aquila
- Aquila Greengrass
- Arabella Ballantyne
- Arabella Figg
- Arabella Figg's parents
- Arabella Langley
- Arabian Sea
- Aragog
- Araminta Meliflua Black
- Arania Exumai
- Aranshire
- Aravind Chaudhary
- Arben Bajraktaraj
- Arbroath
- Arc de Triomphe
- Arcadinho
- Arcane Tome
- Archaeology
- Archana Shetty
- Archer Evermonde
- Archer Evermonde's emergency legislation
- Archibald (disambiguation)
- Archibald Alderton
- Archibald Bennett
- Archibald Bienbon
- Archibald Eagleton
- Archie Aymslowe
- Archie Bickle
- Archipelago Ridiculus
- Architect of Hogwarts
- Architecture Cup
- Archives of the Norwegian Ministry of Magic
- Archivist
- Arcturus
- Arcturus Black (disambiguation)
- Arcturus Black I
- Arcturus Black II
- Arcturus Black III
- Arcus
- Ardennes
- Area spell
- Aretha Ayeh
- Argentina
- Argentinian Council of Magic
- Argentinian National Quidditch team
- Argo Pyrites
- Argolid Peninsula
- Argos
- Argus Filch
- Argus Filch's chains
- Argus Filch's tool chest
- Argus Filch (Trading Card)
- Argyllshire
- Ariadne Spinners
- Ariana (disambiguation)
- Ariana Dumbledore
- Ariana Dumbledore's favourite soup
- Ariel Singleton
- Ariella Paradise
- Arielle Brown
- Aries
- Arif Sikander
- Arinzé Kene
- Aristotle Twelvetrees
- Arithmancer
- Arithmancy
- Arithmancy (class)
- Arithmancy Achievement Accolade
- Arithmancy essay
- Arizona
- Arizona coral snake
- Arjeplog
- Arjuna Balaji
- Arkansas
- Arkie (disambiguation)
- Arkie Alderton
- Arkie Alderton's Kwik-Repair Shop
- Arkie Alderton's alleged son
- Arkie Philpott
- Arlene Piper
- Armadillo
- Armadillo Bile Mixture
- Armadillo bile
- Armadillo to Pillow
- Arman Shettigar
- Armand Malfoy
- Armando Dippet
- Armando Dippet's broomstick
- Armando Dippet: Master or Moron?
- Armchair to human spell
- Armenia
- Armenian Junior Nationals Quidditch team
- Armenian warlock
- Armin Coralic
- Armotentia
- Armoury
- Arn
- Arn's Goblin-Made Helmet
- Arnaud Adam
- Arnica
- Arnold
- Arnold (disambiguation)
- Arnold Guzman
- Arnold Montey
- Arnold Peasegood
- Arnold Streeton
- Arnold Vogler
- Arnulf Moe
- Aron Woodbridge
- Arrest spell
- Arresto Momento Duo
- Arrow
- Arrow Shooting Spell
- Ars moriendi
- Arsenia Gonzales
- Arsenius Jigger
- Arsenius Jigger's potion ingredient editorial
- Art
- Art Classroom
- Art Club for Gryffindor
- Art Deco
- Art historian
- Artefact Room
- Artefact taxonomy
- Artem Sinelnikov
- Artemis (goddess)
- Artemis (owl)
- Artemisia Blackwood
- Artemisia Blackwood's father
- Artemisia Blackwood's mother
- Artemisia Lufkin
- Artemius Lawson
- Arthur (Hufflepuff student)
- Arthur (disambiguation)
- Arthur (king)
- Arthur (series)
- Arthur A. Levine Books
- Arthur Bowen
- Arthur Conan Doyle
- Arthur G.
- Arthur Plummly
- Arthur Plummly's father
- Arthur Plummly's mother
- Arthur Siggs
- Arthur Weasley
- Arthur Weasley's brothers
- Arthur Weasley's contact at the Floo Regulation Panel
- Arthur Weasley's file
- Arthur Weasley's letter to Harry Potter
- Arthur Weasley's letter to Ronald Weasley
- Arthur Weasley's non-magical junk
- Arthur Weasley's shed
- Arthur Weasley's ten unidentified subordinates
- Arthur Weasley's wand
- Arthur Weasley (Trading Card)
- Arti Shah
- Artichoke
- Arts & Warts
- Arts Council England
- Arturo Cephalopos
- As You Like It
- Asahi Uchida
- Ascension Charm
- Asgard Pettersson
- Asgeir Knutsen
- Ash
- Ash and dragon heartstring wand
- Asha
- Asha James
- Ashish Patel
- Ashley (disambiguation)
- Ashley Artus
- Ashley Beaver
- Ashley Hudson
- Ashley Hull
- Ashley Martin
- Ashley McGuire
- Ashley Sanders
- Ashley Virgil
- Ashley Whitehead
- Ashok Khanna
- Ashwinder
- Ashwinder Assassin
- Ashwinder Duellist
- Ashwinder Executioner
- Ashwinder Ranger
- Ashwinder Scout
- Ashwinder Soldier
- Ashwinder at the Magical Creatures Reserve
- Ashwinder egg
- Ashwinders
- Asia
- Asian Dragon Hair
- Asiatic Anti-Venoms
- Asier Newman
- Asif Ali
- Ask D. Shaman
- Asma Rahman
- Aspartame
- Aspect
- Aspen
- Asphodel
- Assassin
- Assassination of Silvanus Selwyn
- Assorted Sour Strips
- Assorted Sours
- Assyria
- Aston Scott
- Astor Bellchant
- Astor Bellchant's owl
- Astoria (disambiguation)
- Astoria Crickett
- Astoria Malfoy
- Astoria Malfoy's ancestor
- Astral Fiasco Fireworks
- Astrid Cole
- Astrid Cole's Herbology lab
- Astrid Cole's classmate
- Astrid Cole's father
- Astrid Cole's mother
- Astrid Cole's thinking board
- Astrid Cole's wand
- Astrix Alixan
- Astro News
- Astrolabe
- Astrology
- Astronomer
- Astronomy
- Astronomy Club
- Astronomy Corridor
- Astronomy Room
- Astronomy Stairs
- Astronomy Tower
- Astronomy Tower courtyard
- Astronomy Wing
- Astronomy classroom
- Astronomy department
- Astronomy homework meeting
- Astronomy reading room
- Asuka
- Athan Bellos
- Athenaeum
- Atlanta
- Atlantic Ocean
- Atlantic Records
- Atlantic cod
- Atlas of Celestial Anomalies
- Atmospheric Charm
- Atomhawk Design Ltd
- Atrium
- Atsushi Takagi
- Attack at Aranshire
- Attack at Dedalus Diggle's house
- Attack at Godric's Hollow (1981)
- Attack at Godric's Hollow (1997)
- Attack at Godric's Hollow (disambiguation)
- Attack at Hogsmeade Station
- Attack at The Burrow
- Attack at the Great Lake
- Attack at the Romanian Dragon Sanctuary
- Attack at the Tonks house
- Attack in Hogsmeade
- Attack in Kenilworth
- Attack in Little Whinging
- Attack in the Forbidden Forest
- Attack in the Forest Grove
- Attack in the Spider's Lair
- Attack in the Tianzi Mountains
- Attack of the Killer Forest
- Attack on Alastor Moody
- Attack on Ariana Dumbledore
- Attack on Arthur Weasley
- Attack on Eleazar Fig and George Osric
- Attack on Frank and Alice Longbottom
- Attack on Harry Potter in Hogsmeade
- Attack on Irma Dugard
- Attack on London
- Attack on Viktor Krum and Bartemius Crouch Senior
- Attila G. Kerekes
- Aubergine
- Audrey (disambiguation)
- Audrey Eubanks
- Audrey Weasley
- Augurey
- Augurey at the Magical Creatures Reserve
- August
- Augusta Longbottom
- Augusta Longbottom's Howler to Neville Longbottom