John James Osborne (12 December 1929 – 24 December 1994) was an English playwright, screenwriter, actor, and entrepreneur, who is regarded as one of the most influential figures in post-war theatre. Born in London, he briefly worked as a journalist before starting out in theatre as a stage manager and actor.  He lived in poverty for several years before his third produced play, Look Back in Anger (1956), brought him national fame.

Based on Osborne's volatile relationship with his first wife, Pamela Lane, it is considered the first work of kitchen sink realism, initiating a movement which made use of social realism and domestic settings to address disillusion with British society in the waning years of the Empire. The phrase “angry young man”, coined by George Fearon to describe Osborne when promoting the play, came to embody the predominantly working class and left-wing writers within this movement. Osborne was considered its leading figure due to his often-controversial left-wing politics, though critics nevertheless noted a conservative strain even in his early writing. 

Osborne lived his later years in Clun, Shropshire.