Glenn David Williams (born July 18, 1977 in Gosford, New South Wales) is a third baseman from Australia, who plays in the Minnesota Twins organization. He played in Major League Baseball for the Twins during the 2005 season. He was a member of the team that won the silver medal at the 2004 Summer Olympics in Athens, Greece. Williams currently has a 13-game hitting streak, as he has a hit in every game that he has played in while in the major leagues.

Glenn is the eldest of two children. His father Gary Williams has been heavily involved in the development of baseball in Australia. Both Gary and Glenn Williams have represented their native Australia in international baseball competitions.

In 1993, as a 16-year old, Glenn signed a lucrative free agent contract with the Atlanta Braves for an estimated 1.3 million Australian dollars. Since that time, Glenn has played baseball for the minor league affiliates of the Atlanta Braves, Toronto Blue Jays, and Minnesota Twins.