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Halloween is an American horror franchise that consists of ten slasher films, novels, and comic books. The franchise focuses on the fictional character of Michael Myers who was committed to a sanitarium as a child for the murder of his older sister. Fifteen years later, he escapes to stalk and kill the people of Haddonfield, Illinois while being chased by his former psychiatrist Dr. Sam Loomis. Michael's killings occur on the holiday of Halloween, on which all of the films primarily take place.

The original Halloween was released in 1978. Written by John Carpenter and Debra Hill, and directed by John Carpenter, the sequels have had various writers and directors attached to them. Michael Myers is the antagonist in all of the films except Halloween III: Season of the Witch, which has no direct connection to any other Halloween film in the series. Carpenter, who had a hand in writing the first sequel, has not had any direct involvement with the rest of the films. The film series is ranked fourth at the United States box office–in adjusted 2008 dollars–when compared to other American horror franchises. The first Halloween film is credited with beginning a long line of slasher films inspired by Alfred Hitchcock's Psycho. The franchise began when the first novel appeared less than a year after the release of the first film, and then seven sequels have followed. Then, in 2007, a remake of Halloween was produced, with a direct sequel released two years later.