Gemerské Dechtáre (Hungarian: Détér) is a village and municipality in the Rimavská Sobota District of the Banská Bystrica Region of southern Slovakia.
In historical records, the village was first mentioned in 1246 (1246 Deltar, 1384 Dehcher, 1427 Dether), when it belonged to Ratoldoy family. In the 16th century Turks pillaged the village. In consequence of this, epidemics hit its inhabitants. From 1938 to 1945 it belonged to Hungary.