Night of the Big Heat is a 1967 British science fiction film directed by Terence Fisher, and starring Patrick Allen, Christopher Lee, Peter Cushing and Jane Merrow.It was based on the 1959 novel of the same name by John Lymington, and was released in the UK by Planet Film Productions.

The film was released theatrically in the United States in the winter of 1971 by Maron Films as Island of the Burning Damned where it was paired on a nationwide double bill with Godzilla's Revenge (1969), but the poster art confused it with Island of Terror (1966) which also starred Peter Cushing. The title was changed years later to Island of the Burning Doomed for American television.