Zack Greer (born February 12, 1986 in Whitby, Ontario) is a Canadian professional lacrosse player who plays for the San Diego Seals 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 played in the National Hockey League for 14 seasons from 2002-2017.