Randall Duane Williams (born September 18, 1975) is an American former professional baseball pitcher.

He appeared in 6 games for the Mariners in 2004 and during the offseason, he was traded to the San Diego Padres for Billy Hogan.

In 2006, he re-signed with the Rockies and played the entire year for their Triple-A affiliate, the Colorado Springs Sky Sox.

He became a free agent at the end of the 2008 season and signed a minor league contract with an invitation to spring training the Chicago White Sox on January 12, 2009.

In 2012, Williams signed with the Saitama Seibu Lions in Nippon Professional Baseball (NPB).