Ryan Joseph O'Malley (born April 9, 1980) is a former Major League Baseball pitcher who played for the Chicago Cubs in 2006.

O'Malley made his major league debut for the Cubs on August 16, 2006, against the Houston Astros.

He pitched eight innings, giving up five hits, six walks, two strikeouts and no runs in a 1–0 win.

On January 9, 2007, the Cubs announced that O'Malley would be among 11 non-roster players invited to spring training camp in Mesa, Arizona.

On December 2, 2009, O'Malley was named the pitching coach for the Arizona League Rangers.