B

Ludovic "Ludo" Bagman ~ Head of the Department of Magical Games and Sports at the Ministry of Magic. [4,5]

Millicent Bagnold ~ Minister for Magic before Fudge. [5,5]

Bathilda Bagshot ~ Author of A History of Magic. [1,5]

Bane ~ A centaur. [1,15]

Banishing Charm ~ The opposite of the summoning charm; incantation not given. [4,26]

The Bloody Baron ~ The Slytherin ghost. [1,7]

Basilisk ~ The king of serpents, with a fatal glare and a fear of chickens. [2,16]

Bat-Bogey Hex ~ Enlarges the target's bogies to the size of a bat, with wings, and makes them attack his or her face. A Ginny Weasley specialty. [5,6]

Prefects' Bathroom ~ An exclusive room at Hogwarts, complete with multiple bubble bath supplies ... and a bath like a small swimming pool. [4,23]

Beaters ~ In Quidditch, beaters keep the Bludgers away from their team - and direct them toward the opposing team. [1,10]

Beauxbatons Academy of Magic ~ France's equivalent of Hogwarts. [4,9]

Humphrey Belcher ~ Premature inventor of the Cheese Cauldron. [6,10]

Katie Bell ~ Chaser for Gryffindor's Quidditch team. [1,11]

Bezoar ~ A stone, taken from the stomach of a goat, which will give protection from most poisons. [1,8]

Professor Binns ~ A ghost, and teacher of the History of Magic. [1,8]

Mrs. Black ~ Sirius' mother; deceased, but carrying on as usual from her picture. [5,4]

Regulus Black ~ Sirius's younger brother; joined the death-eaters, but later repented and was murdered by Lord Voldemort. [5,6]

Sirius Black ~ Wizard; Harry Potter's Godfather, a close friend of James Potter. [1,1]

Blast-Ended Skrewt ~ Magical creature; produces explosive effects at one end. Possibly a cross between a manticore and a fire crab. [4,13]

Blood Replenishing Potion ~ A temporary remedy for serious bleeding. [5,22]

Bludgers ~ In Quidditch, black balls - slightly smaller than the Quaffle - that rocket around, trying to knock players off their brooms. [1,10]

Libatius Borage ~ Author of Advanced Potion Making. [6,9]

Broderick Bode ~ Wizard with long-term spell injury at St Mungo's. [5,23]

Boggart ~ A shapeshifter, a creature if dark enclosed places, that can adopt any form most likely to frighten. [3,7]

Bones ~ Wizarding family that had been attacked during Voldemort's reign of terror. [1,4]

Amelia Susan Bones ~ Head of the Department of Magical Law Enforcement at the Ministry; murdered by Lord Voldemort or his Death Eaters. [5,7]

Susan Bones ~ A Hufflepuff student at Hogwarts. Her aunt works at the Ministry of Magic. [1,7]

Terry Boot ~ Student in Harry's year; sorted to Ravenclaw. [1,7]

Betty Braithwaite ~ Journalist with the Daily Prophet. [7,2]

Professor Charity Burbage ~ Teacher of Muggle Studies at Hogwarts [7,1]

Caractus Burke ~ Partner in Borgin & Burke's [6,12]

Borgin & Burkes ~ Tradesmen in Knockturn Alley, specializing in objects with unusual and powerful properties. [2,4]

Bertie Bott's Every-Flavour Beans ~ A wizard confection, flavours include ear wax and chocolate. [1,6]

Bowtruckle ~ A tree guardian, mainly found in wand trees; aggressive when roused, but can be placated with a gift of wood lice or fairy eggs. [5,13]

Bozo ~ Rita Skeeter's photographer. [4,24]

Brockdale Bridge ~ Bridge destroyed in a failed attempt to blackmail the Ministry of Magic. [6,1]

Mandy Brocklehurst ~ Student in Harry's year; sorted to Ravenclaw. [1,7]

Lavender Brown ~ Student in Harry's year; sorted to Gryffindor. [1,7]

Frank Bryce ~ The Riddles' gardener, accused of their murder. [4,1]

Bubble-Head Charm ~ Surrounds the head with air bubbles, to enable breathing underwater. [4,26]

Bubotuber ~ Magical plant; produces pus which is an effective acne remedy. If used correctly. [4,13]

Buckbeak ~ A hippogriff, later renamed Witherwings. [3,6]

Budleigh Babberton ~ Village where Horace Slughorn was found. [6,4]

Millicent Bullstrode ~ Student in Harry's year; sorted to Slytherin. [1,7]

Caractus Burke ~ Partner in Borgin & Burke's [6,13]

The Burrow ~ Home of the Weasleys, near Ottery St Catchpole. [2,3] Butterbeer ~ A beverage, taken hot or cold. [3,8]