Babbling Curse
Incantation: Unknown
Description: The Babbling Curse is presumed to cause a person to babble whenever they try to speak.
Seen: In Chamber of Secrets, Gilderoy Lockhart falsely claimed to have cured this curse.

Banishing Charm
Incantation: Unknown
Description: Opposite to "Accio". Banishes the object the spell is performed on.
Seen: Seen in Goblet of Fire, in their Charms class Harry and Hermione perfectly banish their cushions.

Bat-Bogey Hex
Incantation: Unknown
Description: Grotesquely enlarges the target's bogeys, gives them wings, and sets them attacking the target.
Seen: Ginny Weasley is depicted as an accomplished caster of this particular spell having hexed Draco Malfoy and Zacharias Smith.

Bedazzling Hex
Incantation: Unknown
Description: Similar to a Disillusionment Charm, it can be used to conceal a person or an object. Is also used to make invisibility cloaks.
Seen: Mentioned by Xenophilius Lovegood when discussing how Invisibility Cloaks may be created.

Brachiabindo
Incantation: Brachiabindo
Description: Binds the limbs tightly. Countercurse is Emancipare.
Bubble-Head Charm
Description: Puts a large bubble of air around the head of the user. Used as a magical equivalent of a scuba set or self-contained breathing apparatus.
Seen: Used underwater by Cedric Diggory and Fleur Delacour in the second task of the Triwizard Tournament.
In Order of the Phoenix, many Hogwarts students used the charm when walking through the hallways because of the absolute stinkiness caused by the various pranks played on Dolores Umbridge.

Caterwauling Charm
Incantation: Unknown
Description: Anyone entering the perimeter of a Caterwauling Charm sets off a high-pitched shriek.
Seen: In Deathly Hallows, cast by Death Eaters over Hogsmeade to protect against intruders.
Very similar to a muggle intruder charm.

Capacious Extremis
Incantation: Capacious Extremis
Description: Causes a container's capacity to be increased, without changing the object's external appearance or its weight noticeably. The container may be carried or used as normal. Known as the Undetectable Extension Charm.
Seen: This spell is used by Mr Weasley to allow eight people, six large trunks, two owls, and a rat to fit comfortably inside his modified Ford Anglia in Chamber of Secrets. Hermione casts this spell upon her small beaded handbag in Deathly Hallows. Known to be illegal.

Cave Inimicum
Incantation: Cave Inimicum
Pronunciation: kah-vay i-ni-mee-kəm
Description: Spell used to strengthen an enclosure from enemies.
Seen: Cast by Hermione and Harry Potter to strengthen their campsites' defences.

Cheering Charm
Description: Causes the person upon whom the spell was cast to become happy and contented, though heavy-handedness with the spell may cause the person to break into an uncontrollable laughing fit.
Seen: First seen in Harry Potter and the Prisoner of Azkaban.

Colloportus
Incantation: Colloportus
Pronunciation: kol-o-por-təs
Description: Magically locks a door, preventing it from being opened by Muggle means. Functions as the counter spell to Alohomora
Seen: Cast by Hermione in the Department of Mysteries.

Blasting Curse
Incantation: Confringo
Pronunciation: kon-fring-goh
Description: Causes anything that the spell meets to explode in flames.
Seen: Seen only in Deathly Hallows. Cast by Harry to destroy the sidecar of the flying motorbike. Used by Hermione in an attempt to kill Nagini and facilitate an escape from Bathilda Bagshot's house in Godric's Hollow.