- This article is about the baseball pitcher. For the infielder, see Steve Ontiveros (infielder).
Steven Ontiveros (born March 5, 1961) is a former pitcher in Major League Baseball. From 1985 through 2000, Ontiveros played for the Oakland Athletics (1985–88, 1994–95), Philadelphia Phillies (1989–90), Seattle Mariners (1993) and Boston Red Sox (2000). He batted and threw right-handed. He attended the University of Michigan where he gained a Bachelor of Science degree in Physical Education.
In a ten-season career, Ontiveros posted a 34-31 record with 19 saves and a 3.67 ERA in 207 games pitched (73 as a starter). He is best remembered for giving up Jeff Conine's game-winning home run at the 1995 Major League Baseball All-Star Game, a game in which Ontiveros was credited with the loss on behalf of starter Randy Johnson.
He now works at Spin Doctor in Scottsdale, Arizona. In 2008, he was the pitching coach for the Chinese National baseball team in the Beijing Olympics.