Reinevatn is a lake in the municipality of Bykle in Agder county, Norway. The 2.86 km2 lake is located south of the lakes Store Urevatn and Vatndalsvatnet in the Setesdalsheiene mountains in the Setesdal valley, about 10 km northwest of the village of Bykle. The lake has a dam on the southern edge which keeps the water level at an elevation of 1170 m above sea level. The dam's spillway flows into the nearby river Skargjesåni. The Snjoheinuten mountain lies just to the northeast of the lake.