Petrinje (; ) is a small village in the Municipality of Hrpelje-Kozina in the Littoral region of Slovenia.
Petrinje is the site of a mass grave associated with the Second World War. The Wasp Shaft Mass Grave () is located in a terraced area west of Brdgodec Hill (elevation: ) north of Petrinje. It contains the remains of undetermined victims.
The local church is dedicated to Saint Sebastian and belongs to the Parish of Klanec.