Joseph Scaddan (1 August 1886 - 21 July 1971) was an Australian rules footballer who played for Collingwood in the Victorian Football League (VFL) and Subiaco in the West Australian Football League (WAFL).
A defender from South Bendigo, Scaddan spent just one year with Collingwood. He was one of six Collingwood footballers to play in every game of the 1910 VFL season and was a half back flanker in their winning Grand Final team. The next stage of his career was spent in Western Australia, where he captain-coached Subiaco to a premiership in 1912. He also participated in Subiaco's 1913 and 1915 premierships, having resigned as coach.
Scaddan had a brother, Albert, who played at Carlton in 1914 and a brother-in-law, Tom Cain, who was a successful coach in the WAFL. His older brother, John Scaddan, served as Premier of Western Australia.