"Millennium" is a period of one thousand years. It's also a common name for works of fiction. It may refer to:
- Millennium, the 1996 TV show created by Chris Carter.
- Millennium, the 1988 DC Comics crossover miniseries.
- Millennium, the 1983 John Varley novel
- The Millennium Trilogy novels by Stieg Larsson, or the films based on them.