Stačkūnai is a village in Biržai District Municipality, in Panevėžys County, Lithuania. Stačkūnai lies at 57 m above sea level. It has 37 inhabitants (2021). The nearest city is Panevėžys, 61 km to the southwest. Near the border: Latvia, 14 km. Among the landmarks around are Church of the Assumption of Mary in Skaistkalne (21 km), Biržai Castle (4.9 km) and Lutheran church in Nereta (31 km). Among the natural features are Cow cave (7.8 km).