Dead reckoning is a process for estimating the value of a variable quantity by using a previous value and adding any changes.

Dead Reckoning may also refer to:

Film and television Dead Reckoning (1947 film), a film by John Cromwell Dead Reckoning (1990 film), a film by Robert Michael Lewis Dead Reckoning (2020 film), a film by Andrzej Bartkowiak Mission: Impossible – Dead Reckoning Part One, a 2023 film Land of the Dead or Dead Reckoning, a 2005 film, or the name of the firework launching vehicle from the film "Dead Reckoning" (The Professionals), an episode of the television series "Dead Reckoning", an episode of the television series NCIS "Dead Reckoning" (Justice League Unlimited), a television episode "Dead Reckoning" (Person of Interest), a season 2 episode of Person of Interest

Game Dead Reckoning (video game), a 1998 computer game by Piranha Interactive Publishing

Literature Dead Reckoning (novel), the eleventh novel in The Southern Vampire Mysteries by Charlaine Harris Dead Reckoning, a novel by Kenneth Bulmer Dead Reckoning: Memories of the 1971 Bangladesh War, a book of history by Sarmila Bose Dead Reckoning, a play by Eric Chappell Dead Reckoning, a 1978 novel by C. Northcote Parkinson

Music Dead Reckoning (album), a 2007 album by Threshold Dead Reckoning Records, a record label Dead Reckoning, a 2001 album by Small Brown Bike Dead Reckoning, a 2011 album by The Builders and the Butchers "Dead Reckoning", an instrumental composition by Clint Mansell "Dead Reckoning", a song by Diamond Head from the album Am I Evil "Dead Reckoning", a song by Ratt from the album Ratt "Dead Reckoning", a song by Petra from the album This Means War!