Băile Tușnad is a town in Harghita County, Romania in eastern Transylvania. With a population of 1,372, it is the smallest town in Romania by population. It is located at an altitude of 650 m 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. The town administers one village, Carpitus.