Alex Hadley (born 14 September 1973) is an Australian Paralympic swimmer from the United Kingdom. He was born in Staines, England. He competed but did not win any medals at the 1996 Atlanta Games. At the 2004 Athens Games, he won a gold medal in the Men's 4 × 100 m Medley 34 pts event and a silver medal in the Men's 4 × 100 m Freestyle 34 pts event. He also competed but did not win any medals at the 2008 Beijing Games.