Half-life (disambiguation)
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Half-life is a mathematical and scientific description of exponential decay.

Half-life may also refer to:

• Biological half-life, pertaining to organisms (also refers to "elimination half-life", a pharmacokinetic parameter in medicine)
  • Effective half-life, the effective radioactive half-life in organisms after accounting for excretion.
• Half-Life (series), a video game series
  • Half-Life (video game), a first-person shooter video game
  • Half-Life 2, its sequel
• Halflife (comics), the name of two different Marvel comic characters
• Half Life (album), the former name of an album by Eric West
• Half Life (3 album), album by the band 3
• Halflife (EP), an EP by Lacuna Coil
• Half-Life E.P., an EP by Local H
• Halflife (musical), a play by Forbes Allen
• Half Life (1977 play), a 1977 play by Julian Mitchell
• Half Life (2005 play), a 2005 play by John Mighton
• Half-Life (novel), a 2004 gay youth novel by Aaron Krach
• Half Life (novel), a 2006 novel by Shelley Jackson
• Half Life (1999 novel), a science fiction novel by Hal Clement
• Half Life (band), a hardcore punk rock band from Pittsburgh
• "Half Life" (1973 short story), a science fiction short story by Rachel Cosgrove Payes

Half-life may also refer to:

• A term used for posthumous consciousness in Philip K. Dick's novel Ubik

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