Ruffian

A ruffian is a scoundrel, rascal or unprincipled, deceitful, and unreliable person.

Ruffian may refer to:
 * Ruffian (horse) (1972–1975), a famous thoroughbred racehorse
 * Ruffian (film), a 2007 television movie about the racehorse
 * Ruffian Games, a Scottish games developer
 * Ruffian, a chess engine
 * Ruffian 23, Irish sailboat designed by Billy Brown
 * Border Ruffians, pro-Slavery activists from Missouri in the American Civil War
 * The Ruffian on the Stair, a 1964 British play
 * HMS Bellerophon (1786), also known as Billy Ruffian
 * The Ruffians, the major antagonists of the Nintendo game Sin and Punishment
 * British codename of the German X-Geraet, radar system
 * The Ruffian, a 1983 French-Canadian criminal adventure film