Koš is a municipality in Prievidza District, in the Trenčín Region, Slovakia. Koš lies at 270 m above sea level, at the foot of the Vtáčnik mountains. It has 1,002 inhabitants (2025). The nearest city is Prievidza, 4.3 km to the northeast. Among the landmarks around are Holy Trinity church in Prievidza (4.3 km), St. Bartholomew church (4.5 km) and Church of the Assumption of the Holy Virgin (5.0 km). Among the natural features are Linden Tree of King Matthias (3.9 km) and Prepostska jaskyna (3.6 km).