Undheim is a village in Time municipality in Rogaland county, Norway. The village is located in Jæren, about 14 km south of the village of Ålgård, about 12 km southeast of the town of Bryne, and about 7 km east of the village of Nærbø. The village of Mossige lies just to the northwest of Undheim. The 0.42 km2 village has a population (2015) of 497, giving the village a population density of 1183 PD/km2. The main economic activity in and around Undheim is agriculture. It is mainly centered around dairy, beef, pork, and sheep, as well as cultivating fungi and potatoes. The Norwegian poet and writer Arne Garborg (1851-1924) was born on a small farm just outside Undheim. Undheim Church is located in the village.