The Čudnić (Serbian Cyrillic: Чуднић) is a left, western tributary of the Vrbanja in Bosnia and Herzegovina. It flows to Panići village and empties into the village of Čudić in the village of Kruševo Brdo, below (Arab's hill). It springs on the southeastern slopes of the lower Vlašić's plateau, below the Ilomska and its tributaries. The spring is on a riverhead with the Kovačevića creek and the Ćorkovac creek. The tributary flows deep and fast; it is the local population's belief that the Čudnić is flowing over a part of the water of the Ilomska confluence.