Reliability may refer to:

  • Reliability (engineering) and also a branch of statistics, the ability of a system or component to perform its required functions under stated conditions for a specified period of time.
  • Reliability (psychometrics), of a set of data and experiments
  • High reliability is informally reported in "nines"
  • Reliabilism in philosophy and epistemology
  • Data reliability, a property of some disk arrays in computer storage
  • Reliability theory, as a theoretical concept, to explain biological aging and species longevity
  • Reliability (computer networking), a category used to describe protocols
  • Reliability (semiconductor), outline of semiconductor device reliability drivers