Ostrý Grúň (Hungarian: Élesmart) is a village and municipality in the Žarnovica District, Banská Bystrica Region in Slovakia.

The village was massacred and burned down in January 1945 by the Nazi anti-partisan unit Edelweiss, after the suppression of the Slovak National Uprising.

[4] The municipality lies at an altitude of 450 metres, covering an area of 16.71 km².

The religious makeup was 75.6% Roman Catholic and 4.2% unaffiliated.

This Banská Bystrica Region geography article is a stub.