Tønjum is a village in Lærdal Municipality in Vestland county, Norway.

The village is located along the river Lærdalselvi, about 5 kilometres (3.1 mi) southeast of the municipal centre of Lærdalsøyri.

The eastern end of the Lærdal Tunnel (part of the European route E16 highway) is located just north of Tønjum.

The highway leaves the tunnel and heads south through Tønjum, past Tønjum Church, and then east towards the village of Borgund and the Filefjell mountains.

In recent years, the growing of cherries has become more prevalent.