Brenäs is a village in Finspång Municipality, in Östergötland County, Sweden. Brenäs lies at 60 m above sea level. The nearest city is Katrineholm, 14.0 km to the northeast. Among the landmarks around are Rejmyre Church (10.9 km), Skedevi Church (8.1 km) and Västra Vingåker Church (17.1 km).