Bolstadfjorden is a 12 km (7.5 mi) long fjord in Vaksdal and Voss municipalities in Vestland county, Norway.

There is a threshold at 35 metres (115 ft) creating two basins, the outer 4.6 km2 (1.8 sq mi).

The Vosso River flows into Bolstadfjorden and brings freshwater from a 1,500 km2 (580 sq mi) catchment area.

[2][3][4] The main road from Bergen-Voss-Oslo (European route E16) runs along the south shores of the fjord.

The Voss Line originally ran along the south shore, partly through 10 short tunnels.