Bihor was a former medieval castle and town, now in ruins, approximately 10 kilometres (6.2 mi) north of present-day Berane, Montenegro.
The first surviving mention of the name "Bihor" in the area is in a 1450 document in the Dubrovnik archives, "In loco vocato Bichor".
After the rise of Nikolj-pazar (Bijelo Polje, first mentioned in 1589) it slowly fell into decline, remaining only as a military outpost with crew of 250 soldiers and 4 cannons, its primary task being the control of Vasojevići, who once exterminated the whole army from both the fortress and the region during the battle of Suvodol.
The wall of the castle stands up to 3 metres (9.8 ft) above the surrounding ruins.
Bihor is located on a limestone plateau above the confluence of the River Lješnica [ceb] (Eleshnitsa) and the Lim.