A
- Algie – Great uncle of Neville Longbottom, gave Trevor to Neville
- Alguff the Awful – Foul smelling goblin who attempts to sell vials of his sweat to Dungbomb manufacturers
- Agnes – Patient in the Janus Thickey Ward of St Mungo's
- Andros the Invincible – Ancient Greek wizard, alleged to have a Patronus the size of a Giant
- Aragog – Acromantula belonging to Rubeus Hagrid, lives in the Forbidden Forest, dies in Half-Blood Prince
- Arcus – Thought to have taken the Elder Wand from Loxias
- Arnold – Pygmy Puff belonging to Ginny Weasley
B
- Bane – Centaur who lives in the Forbidden Forest
- Barnabas the Barmy – Subject of a tapestry on the seventh floor of Hogwarts, attempted to dance with trolls
- Basil – Ministry official at the Quidditch World Cup, wears a kilt and poncho in an attempt to replicate Muggle clothing, organizes Portkeys for wizards and witches
- Beedle the Bard – Author of several Wizarding fairy tales, including The Tale of the Three Brothers
- Brother Benedict – Muggle monk who had an encounter with a jarvey
- Bilius – Uncle of the Weasley children, died twenty-four hours after seeing a Grim
- Binky – Rabbit belonging to Lavender Brown
- The Bloody Baron – Slytherin House ghost, suitor and killer of Helena Ravenclaw, killed himself in remorse
- Bogrod – Elderly goblin who works at Gringotts
- Brother Boniface – Muggle monk, maker of turnip wine
- Bozo – Photographer for the Daily Prophet
- Buckbeak (a.k.a. Witherwings) – Hippogriff belonging at various times to Rubeus Hagrid, Sirius Black, and Harry Potter
C
- Cecilia – Girlfriend of Tom Riddle Senior before Merope gives him the love potion
- Circe – Ancient Greek enchantress
- Cliodna (or Cliodne) – Irish druidess, Animagus, discovered the properties of Moondew
