Bertaučiai is a village in Joniškis District Municipality, in Šiauliai County, Lithuania. Bertaučiai lies at 53 m above sea level. It has 87 inhabitants (2021). The nearest city is Šiauliai, 41 km to the southwest. Near the border: Latvia, 5.9 km. Among the landmarks around are Rundāle Palace (35 km), Hill of Crosses (30 km) and Mežmuiža Church in Augstkalne (17.3 km). Among the natural features are Vaineikiai tuberous oak (6.6 km).