Unwritten Law is an American punk rock band formed in 1990.

Unwritten Law may also refer to:

• Oral law, a code of conduct transmitted by oral tradition
• Unspoken rule, a type of social norm
• Unwritten law (Ireland), landholding traditions in Ireland not recognized by law

• The Unwritten Law (1907 film), an American true-crime short film
• Unwritten Law (1916 film), a film produced by the California Motion Picture Corporation
• The Unwritten Law (1922 film), a German silent film directed by Carl Boese
• The Unwritten Law (1925 film), an American silent crime melodrama directed by Edward LeSaint
• The Unwritten Law (1929 film), a British short crime film directed by Sinclair Hill
• The Unwritten Law (1932 film), an American mystery film directed by Christy Cabanne
• The Unwritten Law (1985 film), a Hong Kong drama directed by Ng See-yuen

• Unwritten Law (album), by Unwritten Law, 1998
• "Unwritten Law", a song by the Sound from Jeopardy, 1980
• "The Unwritten Law", a song by Deep Purple from The House of Blue Light, 1987

• Unwritten Law, a play by Edwin Milton Royle; basis for the 1916 film
• "The Unwritten Law Caper", a 1946 episode of the radio series The Adventures of Sam Spade

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