Alacabük is a village in Tatvan District, in Bitlis Province, Türkiye. Alacabük lies at 1,943 m above sea level, in the İhtiyarşahap Dağı mountains. It has 899 inhabitants. The nearest city is Tatvan, 42 km to the west. Among the landmarks around are Narekavank (18.7 km), Karmravank (14.3 km) and Monastery of Surp Gevork of Goms (14.9 km).