A light year is a unit of length equal to the distance light travels in a vacuum in one year. The term may also refer to:
- Lightyear Entertainment, a movie and music distributor
- Lightyear (band), a ska-punk band from the United Kingdom
- Light Years (Kylie Minogue album), a 2000 Kylie Minogue album
- Light Years (Chick Corea album), a 1987 album by the Chick Corea Elektric Band
- Lightyears (Shin Terai album), a 2007 album by Shin Terai, Bill Laswell and Buckethead
- Light Years (Glen Campbell album), a 1988 Glen Campbell album
- "Light Years" (Pearl Jam song), a song by Pearl Jam
- "Light Years" (Jamiroquai song), a song on Jamiroquai's The Return of the Space Cowboy album
- "2000 Light Years from Home", a song by the Rolling Stones
- Light Years (film), a 1988 animated science fiction film
- Light Years, The Very Best Of Electric Light Orchestra, a 1997 compilation of Electric Light Orchestra
- Buzz Lightyear, a fictional character in the animated film series Toy Story
- Light Years, an American TV series that has been renamed Life UneXpected
