Amanda 'Mandy' Drennan (born 22 May 1988 in Cowes, Victoria) is a Paralympic swimming competitor from Australia. She was born without her right leg. She learned to swim as a child on Victoria's Phillip Island but trained in Melbourne several times a week due to the island's lack of facilities. At the age of ten, she competed in her first state championships and a year later represented Australia at the Pacific School Games.