Foul may refer to:

• Foul (sports), an unfair or illegal sports act, including:
• Foul (football), in football (soccer), an unfair act by a player as deemed by the referee
• Professional foul, in football (soccer) or rugby, a deliberate act of foul play, usually to prevent an opponent scoring
• Personal foul, in basketball, illegal personal contact with an opponent
• Technical foul, in basketball, unsportsmanlike non-contact behavior, a more serious infraction than a personal foul
• Flagrant foul, in basketball, unsportsmanlike contact behavior, considered the most serious foul and often resulting in ejection
• Foul (nautical), in nautical terms, to entagle
• Foul ball, in baseball, a batted ball that lands in foul territory
• Foul Madammas, a Middle Eastern food made from fava beans
• Foul play, a synonym for "crime"
• Foul Play, a 1978 movie
• Fouling, in engineering, accumulation of unwanted deposits on solid surfaces

See also

• Fowl
• Sportsmanship
• Violence in sports