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| Character | Description |
| Abbott, Hannah | A Hufflepuff in Harry's year. |
| Ackerly, Stewart | A Ravenclaw student. |
| Agrippa | A character on a chocolate frog card. |
| Alberic | A character on a chocolate frog card. |
| Aragog | Was fed and raised by Hagrid when he was a child. Now is the leader of the giant spiders in the Forbidden Forest. |
| Archie | An old man who likes a healthy breeze around his privates (Quidditch World Cup) |
| Avery | A death eater |
| Baddock, Malcolm | A Slytherin student. |
| Bagman, Ludo | The former Wimbourne wasps beater who was accused of being a death eater and commentated at the Quidditch World Cup. He lost all his money on bets and couldn't pay his debts. |
| Bagman, Otto | Ludo's brother. |
| Bagshot, Bathilda | Author of "A History of Magic". |
| Bane | A centaur. Harry meets him in the Forbidden Forest. |
| Bell, Katie | One of the chasers for Gryffindor. |
| Binns, ? | The History of Magic teacher. He is the only teacher that is a ghost. |
| Black, Sirius | Harry's godfather who was wrongly accused of killing Peter Pettigrew and twelve other muggles. He spent thirteen years in Azkaban. |
| Bletchley,? | The keeper for the Slytherin quidditch team. |
| Bloody Baron | The Slytherin ghost. Nobody knows how he got all of the blood stains on him. |
| Bones | Wizard family that Voldemort killed. |
| Bones, Susan | A Hufflepuff in Harry's year who's parents were killed by Voldemort. |
| Boot, Terry | A Ravenclaw in Harry's year. |
| Bott, Bertie | Invented "Bertie Bott's Every Flavor Beans". |
| Branstone, Eleanor | A Hufflepuff student. |
| Bryce, Frank | The Riddle's gardener who was murdered by Lord Voldemort. |
| Brocklehurst, Mandy | A Ravenclaw in Harry's year. |
| Brown, Lavender | A Gryffindor in Harry's year. |
| Buckbeak | The hippogriff who bit Malfoy and was beheaded for being "savage." Was saved when Hermione and Harry went back in time to save Sirius and Buckbeak. |
| Bulstrode, Millicent | A Slytherin in Harry's year. |
