Bill & Ted's Excellent Adventure is a 1989 American science fiction comedy film directed by Stephen Herek and written by Chris Matheson and Ed Solomon. The first installment of the Bill & Ted franchise, it stars Keanu Reeves, Alex Winter and George Carlin. It follows Bill (Winter) and Ted (Reeves), who travel through time to assemble historical figures for their high school history presentation.

It received positive reviews and was a mild box office success, grossing $40 million against a $10 million budget. Winter and Reeves reprised their roles in two sequels: Bill & Ted's Bogus Journey (1991) and Bill & Ted Face the Music (2020).

There were also Game Boy, NES, and Atari Lynx games released, which were very loosely based on the film's plot. A PC title and nearly identical Amiga and Commodore 64 port were made in 1991 by Off the Wall Productions and IntraCorp, Inc. under contract by Capstone Software and followed the original film very closely.