Undheim is a village in Time municipality in Rogaland county, Norway. The village is located in Jæren, about 14 kilometres (8.7 mi) south of the village of Ålgård, about 12 kilometres (7.5 mi) southeast of the town of Bryne, and about 7 kilometres (4.3 mi) east of the village of Nærbø. The village of Mossige lies just to the northwest of Undheim. The 0.42-square-kilometre (100-acre) village has a population (2015) of 497, giving the village a population density of 1,183 inhabitants per square kilometre (3,060/sq mi).