Beraintsi (Bulgarian: Бераинци, pronounced [bɛˈra.intsi]) is a small village in Tran Municipality, Pernik Province. It is located in western Bulgaria, 82 km from the capital city of Sofia, 6 km from the town of Tran and 13 km from the border with Serbia. To the north is the Ruy Mountain, which rises 1,706 m above sea level. The village has a permanent population of 15 people, although during the summer period it increases to as many as 150 people. Beraintsi was first mentioned in 1447 as Braintsi.