Key: Last Name, First Name - Book first appears in. Short summary.
Bagman, Ludovic - Book 4. Head of Magical Games and Sports department, formerly a Beater for the Wimbourne Wasps.
Bane - Book 1. A centaur in the Forbidden Forest.
Bashir, Ali - Book 4. Wizard who tried to argue about bringing flying carpets into England.
Basil - Book 4. Minstry wizard who, at the Quidditch World Cup, wore a kilt and a poncho.
Bell, Katie - Book 1. Quidditch Chaser for the Gryffindor team.
Binky - Book 3. Lavender Brown's pet rabbit who died.
Binns, Professor - Book 1. History of Magic teacher. The only ghost teacher at Hogwarts.
Black, Sirius - Book 1. Harry's godfather. Wrongly convicted of killing twelve Muggles and Peter Pettigrew. Good friend of Harry's parents.
Bletchly - Book 1. Quidditch Keeper for the Slytherin team.
Bloody Baron - Book 1. The Slytherin ghost. The only one who can control Peeves.
Bole - Book 3. Beater for the Slytherin Quidditch team.
Borgin, Mr. - Book 2. Owner of Borgin and Burkes in Knockturn Alley. Trades dangerous potions/artifacts to Dark wizards.
Bozo - Book 4. Rita Skeeter's photographer.
Brown, Lavender - Book 1. First in Harry's class to be sorted into Gryffindor.
Bryce, Frank - Book 4. Muggle gardener for the late Riddle household, killed by Lord Voldemort.
Buckbeak - Book 3. Hagrid's hippogriff sentenced to death after attacking Draco Malfoy.
Bulstrode, Millicent - Book 1. First in Harry's class to be sorted into Slytherin.