Lux Aeterna, Latin for "eternal light", may refer to:
- Lux Aeterna (Dave Fitzgerald album), a 1997 album by woodwind player Dave Fitzgerald
- Lux Aeterna (Terje Rypdal album), a 2002 album by guitarist Terje Rypdal
- Lux Aeterna (Ligeti), a 1966 choral work used in the film 2001: A Space Odyssey by Hungarian composer György Ligeti
- "Lux Aeterna" (song), the theme song to the film Requiem for a Dream, written by Clint Mansell and performed by Kronos Quartet
- Lux Aeterna, the sixth track on the award-winning 2009 album Calling All Dawns by American composer Christopher Tin
- Lux Aeterna, a 1997 five-movement quasi-Requiem by Morten Lauridsen
- Lux Aeterna for 5 masked musicians, a 1971 avant-garde piece by American composer George Crumb
- Symphony N 5 Lux Aeterna, a 2006 avant-garde piece by Bulgarian composer Vassil Kazandjiev
- Lux Aeterna for organ, a 1974 work by Finnish composer Joonas Kokkonen
- The communion antiphon for the Roman Catholic Requiem Mass