A screwball is a baseball and fastpitch softball pitch that is thrown so as to break in the opposite direction of a slider or curveball. Depending on the pitcher's arm angle, the ball may also have a sinking action. The pitch is sometimes known as the scroogie or airbender.

Carl Hubbell was one of the most renowned screwball pitchers in the history of Major League Baseball. Hubbell was known as the "scroogie king" for his mastery of the pitch and the frequency with which he threw it. Other famous screwball artists include Tug McGraw, inaugural Hall of Fame member Christy Matthewson, and Cy Young Award winners Mike Cuellar, Fernando Valenzuela, Mike Marshall, and Willie Hernández.