Măciuca is a commune located in Vâlcea County, Oltenia, Romania. It is composed of nine villages: Bocșa, Botorani, Ciocănari, Măciuceni, Măldărești, Oveselu (the commune centre), Popești, Ștefănești, and Zăvoieni.

The commune is situated in the southern part of the county, at a distance of 64 km (40 mi) from the county seat, Râmnicu Vâlcea. It lies on the left bank of the Cerna River, which traverses it for 7 km (4.3 mi). Măciuca borders four other communes: Stănești to the north, Gușoeni to the east, Valea Mare to the south, and Fârtățești to the west.