Jason William Grabowski (born May 24, 1976) is an American former Major League Baseball (MLB) outfielder who played for the Oakland Athletics and Los Angeles Dodgers from 2002 to 2005.

Grabowski made his Major League debut for the Athletics on September 22, 2002, against the Rangers, with one strikeout and one walk in his two plate appearances.

Grabowski hit his first Major League home run, off Kerry Wood of the Chicago Cubs, on May 11, 2004.

In the 2005 offseason, Grabowski's contract was sold to the Orix Buffaloes of Japan's Pacific League.

Grabowski was a 2007 non-roster invitee to the Tampa Bay Devil Rays spring training, but did not make the team and was reassigned to the minors.