Băile Tușnad (Romanian pronunciation: [ˈbə.ile ˈtuʃnad]; Hungarian: Tusnádfürdő, pronounced [ˈtuʃnaːtfyrdøː] ⓘ) is a town in Harghita County, Romania in eastern Transylvania.

It is located at an altitude of 650 m (2,130 ft) in the southern reaches of the Ciuc depression, between the Harghita and Bodoc mountains, in the valley of the Olt River, and is to this day an important spa town.

It was an alleged miraculous healing of the son of a shepherd from his rashes that first attracted widespread attention to the therapeutic properties of local mineral waters, after which a company was founded to develop the springs in 1845.

After the Treaty of Trianon of 1920, it became part of the Kingdom of Romania and fell within Ciuc County during the interwar period.

The territory of Northern Transylvania remained under Soviet military administration until March 9, 1945, after which it became again part of Romania.