"Well, what are you waiting for? Everyone stand by a broomstick."
     -- Madam Hooch

Madam Hooch is the Quidditch coach and flying instructor at Hogwarts. She referees the Quidditch matches between the house teams.

Madam Hooch
hair: gray, cut short
eyes: yellow, hawk-like
expertise: Quidditch coach and referee, flying teacher
(SS9; CS ; PA13, 15)

*Madam Hooch's first name is given as "Rolanda" in the Trading Card Game. The Internet Movie Database website lists her first name as "Xiomara." Obviously they can't both be correct. Neither is considered canon until independently confirmed by JKR.