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