Gerald Mark Diduck (/ˈdɪdək/ DID-ək; born April 4, 1965) is a Canadian former professional ice hockey defenceman.
Diduck played 932 games in an NHL career that spanned eight different teams from 1984 to 2001.
He played for the New York Islanders, Montreal Canadiens, Vancouver Canucks, Chicago Blackhawks, Hartford Whalers, Phoenix Coyotes, Toronto Maple Leafs and Dallas Stars.
He is part of hockey lore as the man who ended the career of Islanders legend and teammate Bob Nystrom with an accidental high stick that almost cost Nystrom his eye.
He is the brother-in-law of professional musician and CKY bassist Matt Deis.