Kostolec (Hungarian: Kosfalu) is a village and municipality in Považská Bystrica District in the Trenčín Region of north-western Slovakia.

In historical records the village was first mentioned in 1430.

The municipality lies at an altitude of 495 metres and covers an area of 4.001 km2.

The records for genealogical research are available at the state archive "Statny Archiv in Bytca, Slovakia" Media related to Kostolec at Wikimedia Commons

This Trenčín District location article is a stub.