Literary career of English novelist and playwright John Galsworthy, who used John Sinjohn as a pseudonym, spanned the Victorian, Edwardian and Georgian eras.

In addition to his prolific literary status, Galsworthy was also a renowned social activist. He was an outspoken advocate for the women's suffrage movement, prison reform and animal rights. Galsworthy was the president of PEN, an organization that sought to promote international cooperation through literature.

John Galsworthy was awarded the Nobel Prize in literature in 1932 "for his distinguished art of narration which takes its highest form in The Forsyte Saga."