Rybník is a municipality in Levice District, in the Nitra Region, Slovakia. Rybník lies at 180 m above sea level, at the foot of the Štiavnica mountains. It has 1,388 inhabitants (2025). The nearest city is Levice, 8.5 km to the southeast. Among the landmarks around are Hronský Beňadik monastery (6.2 km), Nitra Castle (35 km) and Sitno (27 km). Among the natural features are Veľký Inovec (13.4 km) and Starohutiansky waterfall (15.3 km).