Kolbaşı is a village in Tatvan District, in Bitlis Province, Türkiye. Kolbaşı lies at 1,687 m above sea level, in the İhtiyarşahap Dağı mountains. It has 266 inhabitants. The nearest city is Tatvan, 15.4 km to the west. Among the landmarks around are Monastery of Surp Gevork of Goms (15.6 km).