Petnjik (Montenegrin: Петњик) is a village in the municipality of Berane, Montenegro.

It is mainly inhabited by people with the Barjaktarović and Babović surnames, while there are inhabitants with surnames: Nedovic, Anđić, Marinković, etc.

The centre of the village is about 4.5 km from Berane.

According to the 2023 census, its population was 533.

This Montenegro location article is a stub.