Zack Greer (born February 12, 1986 in Whitby, Ontario) is a Canadian professional lacrosse player who plays for the Denver Outlaws in Major League Lacrosse and the Edmonton Rush of the National Lacrosse League. Greer attended high school at All Saints Catholic Secondary School in Whitby, and grew up playing box lacrosse. Greer's brother, Bill, plays for the Toronto Rock in the National Lacrosse League. Greer's cousin Shawn Thornton plays for the Florida Panthers in the National Hockey League.