Thermia can refer to the following :
Places and jurisdictions Thermeia, a village in Cyprus the popular and historical name of the Greek island of Kythnos, in the Cyclades (Aegean Greece) the Latin Catholic bishopric of Thermia, 17th century name of the former Roman Catholic Diocese of Ceo (now titular see of Cea), covering both Cycladic islands the Greek Orthodox eparchy (diocese) on the above island
Biology Thermia (gastropod), genus of land snails