C

Sir Cadogan ~ A Knight in a Hogwarts picture. [3,6]

Canary Creams ~ Custard creams that briefly turn the eater into a canary. One of the Weasleys' Wizard Wheezes. [4,21]

Centaur ~ A magical creature, a man to the waist; below that, a horse's body. [1,15]

Chamber of Secrets ~ You'll have to read the book!

Cho Chang ~ Ravenclaw seeker; a year ahead of Harry at Hogwarts, and thought to be extremely pretty. [3,13]

Chaser ~ In Quidditch, Chasers throw the Quaffle, and put it through the Hoops to score. [1,10]

Cheering Charm ~ Leaves the recipient with a feeling of great contentment. For a while. [3,15]

Wizard Chess ~ Just like Muggle chess, except that the pieces are alive. [1,12]

Chinese Fireball ~ Red dragon, with a fringe of fine gold spikes around the face. [4,19]

Chocolate Frogs ~ A wizard confection, featuring cards of Famous Wizards and Witches. [1,6]

Herbert Chorley ~ Muggle Junior Minister (UK) chrmed by a Death Eater; currently living under the misapprehension that he is a duck. [6,1]

Chudley Channons ~ Ron's favored Quidditch team. [2,3]

Cleansweep Seven ~ A Nifty broomstick. [1,9]

Cleansweep ~ An adequate but superceded series of broomstick. [3,13]

Cockatrice ~ A serpent produced from a cock's egg; one injured all three tri-Wizard Tournament champions in 1792. [4,15]

Mrs. Cole ~ Matron of Tom Riddle's orphanage. [6,13]

Colloportus ~ A spell to seal a door closed. [5,35]

Comet ~ A broomstick. Not as good as a Nimbus. [1,10]

Comet 260 ~ A broomstick; a joke beside the firebolt. [3,13]

Common Welsh Green ~ A smooth-scaled species of Dragon still living wild in Britain. [1,14]

Confringo ~ A charm that causes an explosion. [7,4]

Confundus Charm ~ A spell to confuse or deceive others. [3,21]

Conjunctivitus Curse ~ Disrupts vision for a while; can be painful, and often confused with conjunctivitis, by unwary muggles. [4,23]

Vincent Crabbe ~ Thickset and mean, one of Draco Malfoy's Slytherin sidekicks. [1,6]

Crabbe ~ Death Eater; father of Vincent (Slytherin student and friend of Malfoy). [4,33]

Dirk Cresswell ~ Head of the Goblin Liaison Office. [6,4]

Colin Creevey ~ Amateur photographer and student in Ginny Weasley's year. [2,6]

Dennis Creevey ~ Younger brother of Colin. [4,12]

Doris Crockford ~ Greeted Harry on his first visit to the Leaky Cauldron. [1,5]

Crookshanks ~ A bow-legged, ginger cat [3,4]. JKR tells us that Crookshanks is actually half kneazle. [jkrowling.com]

Bartemius "Barty" Crouch ~ Percy Weasley's boss at the Department of International Magical Co-operation, at the Ministry of Magic. [4,5]

Bartemius "Barty" Crouch ~ Son of Percy Weasley's boss at the Ministry of Magic. [4,30]

Crucio ~ The Cruciatus curse; induces unbearable pain. An Unforgivable Curse. [4,14]

Crumple-Horned Snorkack ~ A source of some anxiety to Luna Lovegood. [5,13]

Barnabus Cuffe ~ Editor of the Daily Prophet. [6,4]

Cupboard under the stairs ~ Harry's bedroom for his first few years at the Dursleys. [1,3]