Ryan Scott Mitchell (born 24 April 1977) is an Australian breaststroke swimmer of the 1990s, who won a silver medal at the 2000 Summer Olympics in Sydney as part of the 4×100-metre medley relay team.

Growing up in Adelaide and being coached by Glenn Beringen at the South Australian Sports Institute, Mitchell made his debut at the 1994 Commonwealth Games in Victoria, British Columbia, Canada.

He won selection to the national team for the 1996 Summer Olympics in Atlanta, after dead-heating with Phil Rogers to win the 200-metre breaststroke at the Australian Championships.

Mitchell was replaced in the final by Regan Harrison (who came fourth in the 200-metre breaststroke), who combined with Matt Welsh, Geoff Huegill and Michael Klim to claim silver, behind the Americans who broke the world record.

Under his leadership, the Commission appointed its first General Manager on 28 July 2003 and the Australian Swimmers Association was officially incorporated on 24 September 2003.