Abastumani (Georgian: ) is a small town (daba) and climatic spa in Adigeni Municipality, Samtskhe-Javakheti, Georgia. It is located on the southern slopes of the Meskheti Range (Lesser Caucasus), in the small river valley of Otskhe, 25 km northeast of Adigeni and 28 km west of Akhaltsikhe. As of the 2014 census, it had a population of 937. The Georgian National Astrophysical Observatory is located at Abastumani.