Râmnicu may refer to several places in Romania:
Râmnicu Vâlcea, the capital city of Vâlcea County Râmnicu Sărat, a city in Buzău County Râmnicu de Jos and Râmnicu de Sus, villages in Cogealac Commune, Constanța County
and to: Râmnic, a river in Tulcea and Constanța Counties Râmnicul Sărat, a river in Vrancea, Buzău, and Galați Counties