Mortality may refer to:

• Fish mortality, a parameter used in fisheries population dynamics to account for the loss of fish in a fish stock through death
• Mortality (book), a 2012 collection of essays by Anglo-American writer Christopher Hitchens
• Mortality (computability theory), a property of a Turing machine if it halts when run on any starting configuration
• Mortality rate, a measure for the rate at which deaths occur in a given population
• Mortality/differential attrition, an error in the internal validity of a scientific study