Justin Duff (born 10 May 1988) is a former Canadian professional volleyball player.

He was a member of Canada men's national volleyball team, a bronze medalist of NORCECA Championship (2011, 2013).

In July 2016, he was named to Canada's 2016 Olympic team.

[2] After one season in Portuguese club Benfica Lisbon and one season in Greek Olympiacos Piraeus, he decided to come back to Poland and join Espadon Szczecin team.

This biographical article relating to volleyball in Canada is a stub.