Bertnäs is a settlement in Piteå Municipality, in Norrbotten County, Sweden. It has 80 inhabitants. The nearest city is Piteå, 8.1 km to the south. Beaches nearby: Räkan (5.7 km). Among the landmarks around are Piteå City Church (8.1 km), Öjeby Church (6.2 km) and Rosvik Church (11.0 km).