The Tasmania Southern League One is a soccer league in Southern Tasmania. It sits below the NPL Tasmania and Southern Championship in the Tasmanian league system, and nationally, all these leagues also sit under the A-League. It is run by the Football Tasmania. The league includes teams from Hobart and Southern Tasmania. The league composition has varied in some seasons, containing only senior teams from clubs and at other times also including some reserve teams from clubs higher in the Tasmanian league system.