Balsfjord (Northern Sami:Báhccavuotna or Kven:Paatsivuono) is a municipality in Troms county, Norway. The administrative centre of the municipality is the village of Storsteinnes. Other villages include Mestervik, Mortenhals, and Nordkjosbotn.

The municipality surrounds two fjords: Malangen and Balsfjorden, surrounded by comparatively rich farmlands under majestic peaks including the southern end of the Lyngen Alps.