Unwritten Law may refer to :

Films

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

Legal

• An unspoken rule (type of Social norm)
• An Oral law (type of Law)
• Unwritten law (Ireland), landholding traditions in Ireland not recognized by law

Music

• Unwritten Law, a U.S. punk rock band that started in 1990
• Unwritten Law (album), 1998 album by U.S. band Unwritten Law
• "Unwritten Law", a song by The Sound from their 1980 album Jeopardy
• "The Unwritten Law", a song by Deep Purple from their 1987 album The House of Blue Light

Other uses

• The Unwritten Law Caper, an episode of The Adventures of Sam Spade