<Li> Rupert Grint as Ron Weasley, Harry's best friend at Hogwarts . </Li> <Li> Emma Watson as Hermione Granger, Harry's Muggle - born best friend and the brains of the trio . </Li> <Li> Helena Bonham Carter as Bellatrix Lestrange, one of Voldemort's most loyal Death Eaters and the cousin of Sirius Black . </Li> <Li> Robbie Coltrane as Rubeus Hagrid, the half - giant Gamekeeper and Care of Magical Creatures teacher at Hogwarts and a member of the Order of the Phoenix . </Li>

Cast and crew of harry potter and the order of the phoenix