Half-life is a mathematical and scientific description of exponential or gradual decay.

Half-life, half life or halflife may also refer to:

Film

• Half-Life (film), a 2008 independent film by Jennifer Phang

• Half Life: A Parable for the Nuclear Age, a 1985 Australian documentary film

Literature

• Half Life (Jackson novel), a 2006 novel by Shelley Jackson

• Half-Life (Krach novel), a 2004 novel by Aaron Krach

• Halflife (Michalowski novel), a 2004 novel by Mark Michalowski

• Rozpad połowiczny (), a 1988 award-winning dystopia novel by Edmund Wnuk-Lipiński

Music

• Half Life (3 album) (2001)

• Halflife (EP), an EP by Lacuna Coil and the title track

• Half-Life E.P., an EP by Local H

• "Half Life", a song by 10 Years from The Autumn Effect

• "Half Life", a song by Come from Near-Life Experience

• "Half-Life", a song by Duncan Sheik from Daylight

• "Half Life", a song by Imogen Heap from her album Ellipse

• "Half Life", a song by Prototype from the album Trinity

• "Half Life", a song by Swans from the album Cop

• "Half Life", a song by Trocadero from the album Roses Are Red, Violets Are Blue

• "Half-Life", a song by X Ambassadors from the album Townie

• Halflives, a French-Italian alternative rock band

Television episodes

• "Half-Life", Icons season 3, episode 17 (2004)

• "Half-Life", Odyssey 5 episode 17 (2002)

• "Half Life", La Femme Nikita season 2, episode 7 (1998)

• "Half Life", Logan's Run episode 6 (1977)

• "Half Life", Medical Investigation episode 17 (2005)

• "Half Life", New Tricks series 8, episode 9 (2011)

• "Half Life", Sea Patrol season 3, episode 7 (2009)

• "Half Life", SeaChange season 3, episode 13 (2000)

Video games

Half-Life (series), a video game series developed by Valve

• Half-Life (video game), the first game in the series

• Half-Life: Blue Shift, expansion to Half-Life

• Half-Life: Opposing Force, expansion to Half-Life

• Half-Life: Decay, multiplayer expansion to Half-Life

• Half-Life 2, the second game in the series

• Half-Life 2: Lost Coast, expansion to Half-Life 2 that happens somewhere in-between chapters of Half-Life 2

• Half-Life 2: Episode One, a shorter game following the events of Half-Life 2

• Half-Life 2: Episode Two, a shorter game following the events of Episode One

• Half-Life: Alyx, a prequel to the events in Half-Life 2

See also

• Biological half-life, the time it takes for a substance to lose half of its pharmacologic, physiologic, or radiologic activity

• Effective half-life, the effective radioactive half-life in organisms after accounting for excretion

• Half-life of knowledge, the amount of time that has to elapse before half of the knowledge or facts in a particular area is superseded or shown to be untrue

• Half a Life (disambiguation)