A foul is a sports term referring to a violation of the game's rule.

In baseball:

• foul ball is a batted ball that lands in foul territory

In basketball:

• personal foul is illegal personal contact with an opponent

• technical foul is unsportsmanlike non-contact behavior

• Foul (football) in soccer
• Professional foul is a deliberate act of foul play
• Foul play a synonym for crime
• Foul Play a 1978 movie

Sports terminology

Foul | Fallo (sport) | ファール | Foul