Unterjesingen is a village in the centre of Baden-Württemberg, Germany, in the Tübingen district. Since 1971, it is a part of the city of Tübingen. It has a population of 2 758 on an area of 8,73 km².
Unterjesingen lies in the valley of the small Ammer river, about 2 km to the east of Pfäffingen, which is part of Ammerbuch, and 6 km to the west of the town centre of Tübingen.