Glenn Clark is the former head coach of the Toronto Rock of the National Lacrosse League, and also a former NLL player. Clark played in the NLL from 1998-2006 for both the Rock and the Philadelphia Wings. With the Rock, Clark won five NLL Championships. He also appeared in three National Lacrosse League All-Star Games, two with the Rock, and one with the Wings. In 2003, Clark played for Team Canada as they won the World Indoor Lacrosse Championships. In 2011, he became goaltending coach for Team Canada.
Off the floor, Clark is a physical education teacher at Bayview Secondary School in Richmond Hill, Ontario.