Kaster is a village in West Flanders, Belgium. According to the 2005 census it has a population of 803. The neoclassical St Peter's Church of Kaster, located in the eastern part of the village, dates from 1818.
Kaster is located in the municipality of Anzegem, located just south of this town along the N32 road. To the west is the village of Tiegem, to the south is the village of Kerkhove.