Deadlight or Deadlights may refer to:
Boats Deadlight, a wood or metal shutter fastened over a ship's porthole or cabin window in stormy weather Deadlight, less common term for a deck prism, a porthole fixed in a ship's deck to give natural light to a hold or cabin below deck Operation Deadlight, a 1946 UK naval operation to scuttle German U-boats following the end of WWII
Books Deadlight, first paranormal SF novel of Scottish novelist Archie Roy 1968 The Deadlights, in the works of Stephen King such as It, in particular when referring to Pennywise
Music Deadlight (album), a 2007 album by Finnish band Before the Dawn Deadlights (American band), 1998–2000
Deadlights (EP), a 1996 EP by Norwegian band Gehenna "Deadlight", a song by Draconian from the 2011 album A Rose for the Apocalypse "Deadlight", a song by Sirenia from the 2023 album 1977
Video games
Deadlight (video game), a 2012 video game