Nitrica (Hungarian: Rákosvölgyudvarnok) is a village and municipality in Prievidza District in the Trenčín Region of western Slovakia.
In historical records the village was first mentioned in 1113.
The municipality lies at an altitude of 246 metres and covers an area of 24.034 km². It has a population of about 1260 people.
Coordinates: 48°42.30′N 18°27′E / 48.70500°N 18.450°E / 48.70500; 18.450