There are thirteen films in the Halloween franchise:
Halloween (1978)
Halloween II (1981)
Halloween III: Season of the Witch (1982)
Halloween 4: The Return of Michael Myers (1988)
Halloween 5: The Revenge of Michael Myers (1989)
Halloween: The Curse of Michael Myers (1995)
Halloween H20: 20 Years Later (1998)
Halloween: Resurrection (2002)
Halloween (2007) - Rob Zombie's remake
Halloween II (2009) - Rob Zombie's sequel to his remake
Halloween (2018) - A direct sequel to the 1978 film, ignoring all other sequels
Halloween Kills (2021)
Halloween Ends (2022)