Allastor "Mad Eye" Moody

Alastor "Mad-Eye" Moody is a fictional character in the Harry Potter series of books, an ex-Auror working for the Order of the Phoenix.

As an experienced Auror, who has lost an eye, leg, and part of his nose while fighting the Dark Arts, Moody is cautious—some might say paranoid—and refuses to eat or drink anything which he himself has not prepared. He is particularly conspicuous because of his peculiar magical eye which can see through walls, doors, and the back of his own head (hence the nickname "Mad-Eye").

Brendan Gleeson plays Moody on screen in Harry Potter and the Goblet of Fire.

On the night of the final task, Crouch attempted to kill Harry, but was stopped by Albus Dumbledore, Minerva McGonagall and Severus Snape. Having neglected to take his hourly dose of potion, Crouch returned to his own appearance and, under the influence of Veritaserum, he admitted everything, and Dumbledore rescued the real Moody.

Harry first meets the genuine Moody just prior to his fifth year at Hogwarts, in Harry Potter and the Order of the Phoenix. In that book, Moody has joined the newly reformed Order of the Phoenix, and is usually accompanied by fellow Order members Nymphadora Tonks and Remus Lupin, especially while protecting Harry.

Alastor ("avenger") is a household god in Greek myth called on by families to visit fury upon those who have wronged them.

In a slight alteration made for the film, Moody's nose is still intact. In the book, he blames Evan Rosier for the loss of the end of his nose. In the film, he blames Rosier for the loss of his eye instead.