Ian Warner (born May 15, 1990) is a Canadian track athlete specializing in the 100 metres. Born in Toronto, Ontario, he is the younger brother of Justyn Warner. On June 30, 2012, he finished second behind his brother on 100 meters at the 2012 Nationals Track & Field Championships in Calgary. He competed at the 2012 Summer Olympics in the Men's 4 x 100 metres relay event with his brother Justin.