Iain Jensen (born 23 May 1988 in Belmont, New South Wales) is an Australian sailor.
He started sailing in his hometown of Wangi Wangi when he was five years old, with his Olympic and Artemis Racing team mate Nathan Outteridge.
With Outteridge, he won the 2009 and 2011 49er World Championships and gold at the 2012 Summer Olympics in the 49ers class.
The team also won silver at the 2016 Summer Olympics.He is a member of the NSW Institute of Sport in Sydney and a wing trimmer for Artemis Racing.