Dennis James Stark (born October 27, 1974) is an American former Major League Baseball (MLB) right-handed pitcher who played with the Seattle Mariners across two separate stints, as well as for the Colorado Rockies, from 1999 to 2009.

On December 16, 2001, the Mariners traded Stark with Brian Fuentes and José Paniagua to the Colorado Rockies for Jeff Cirillo.

After his tumultuous season in 2004, Stark signed a minor league deal with the Cleveland Indians.

Stark pitched in Spring Training but never made the team and was shut down for the season due to an elbow injury.

He made his first major league appearance since 2004 on May 3, 2009 when he pitched 2⁄3 of an inning against the Oakland Athletics.