(silver) Ian Allison
1936 basketball
(silver) Robbie Brightwell (a.k.a. Ian)
1964 4x400 m relay
(gold/bronze) Ian O'Brien
1964 swimming - 200 m breaststroke; swimming - 4x100 m medley relay
(bronze) Ian Stewart
1972 5000 m
(silver/gold/bronze) Ian Thorpe
2000; 2004 swimming - 4x100 m freestyle relay; swimming - 4x100 m medley relay; swimming - 4x200 m freestyle relay; swimming - 200 m freestyle; swimming - 400 m freestyle; swimming - 100 m freestyle
(silver/bronze/gold) Ian Crocker
2000; 2004; 2008 swimming - 100 m butterfly; swimming - 4x100 m freestyle relay; swimming - 4x100 m medley relay
(silver/bronze) Nick Willis (a.k.a. Ian)
2008; 2016 1500 m