Tușnad (Hungarian: Tusnád, Hungarian pronunciation: [’tuʃnaːd]) is a commune in Harghita County, Romania. It lies in the Székely Land, an ethno-cultural region in eastern Transylvania, and is composed of three villages:

The commune has an absolute Székely Hungarian majority. According to the 2011 census it has a population of 2,117 which 92.73% or 1,963 are Hungarian.

The village of Tusnád is often referred to as Tuşnad-Sat or Tusnád-Falu to avoid confusion with the touristic centre of Băile Tuşnad to the south. Romanian State Railways also makes this distinction.

Coordinates: 46°08′49″N 25°51′38″E / 46.146941°N 25.860563°E / 46.146941; 25.860563

Băile Tușnad (Romanian pronunciation: [ˈbə.ile ˈtuʃnad]; Hungarian: Tusnádfürdő, Hungarian pronunciation: [ˈtuʃnaːdfyrdøː]) is a town in Harghita County, Romania. It lies in the Székely Land, an ethno-cultural region in eastern Transylvania.

With a population of 1,617, it is the smallest town in Romania by population. It is located at an altitude of 650 metres in the southern reaches of the Ciuc depression, between the Harghita and Bodoc mountains, in the valley of the Olt, and is to this day an important spa town. The town administers one village, Carpitus (Kárpitus).

The town and the surrounding area are famous for their spas and mineral waters received from seven springs. Nearby is the Lake Sfânta Ana, a famous volcanic crater lake, the only one of its kind in Romania.

The water has long been used for bathing by the Székely people. The most probable date for the founding of the bathing station is 1842. 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. The bathing station was destroyed in the skirmishes of 1849, but Austrian Emperor Franz Joseph, on visiting the town in 1852, ordered the reconstruction of the baths. The rapid development of the town began after 1860. The Mikes-source was named in honour of count Benedek Mikes, chairman of the spa committee, who appointed a chemist at his own expense to analyse the water of the spring bearing his name. This marked the start of the scientific evaluation and utilisation of local mineral waters. The Stefánia Medical Center was opened in 1890 and remained the treatment center of the spa until 1975. Lake Csukás (now: Ciucaş) was artificially created in 1900, and the big hotels of the town were built in the 1970s.