Veliki Otok (Italian: Ottocco Grande) is a village north of Postojna in the Inner Carniola region of Slovenia. The entrance to Postojna Cave lies immediately east of the village. A second karst cave, known as Otok Cave (Slovene: Otoška jama), lies 1 km north of the settlement.
The church in the centre of the settlement is dedicated to Saint Catherine. A second church on a small hill close to the entrance to Otok Cave is dedicated to Saint Andrew. Both belong to the Parish of Postojna.