"I'll be back" is a catchphrase associated with Arnold Schwarzenegger. It was made famous in the 1984 science fiction film The Terminator. On June 21, 2005, it was placed at No. 37 on the American Film Institute list AFI's 100 Years... 100 Movie Quotes. Schwarzenegger uses the same line, or some variant of it, in many of his later films.

The Terminator is a 1984 American science fiction action film directed by James Cameron, written by Cameron and Gale Anne Hurd and produced by Hurd. It stars Arnold Schwarzenegger as the Terminator, a cybernetic assassin sent back in time from 2029 to 1984 to kill Sarah Connor, whose unborn son will one day save mankind from extinction by Skynet, a hostile artificial intelligence in a post-apocalyptic future. Kyle Reese is a soldier sent back in time to protect Sarah. The screenplay is credited to Cameron and Hurd, while co-writer William Wisher Jr. received an "additional dialogue" credit.