The Worst Witch is a 1986 British musical fantasy television film based on the first children's book in The Worst Witch series, written in 1974, by the English author Jill Murphy.

The film stars Fairuza Balk as Mildred Hubble, who is the "Worst Witch" at Miss Cackle's Academy for Witches. Charlotte Rae plays Miss Cackle, Diana Rigg stars as Miss Hardbroom, while Tim Curry plays the Grand Wizard who appears at Halloween. The opening and closing song, "Growing Up Isn't Easy", is performed by the English West End theatre star Bonnie Langford.