Astafjord is a former municipality in the old Troms county, Norway. The 310-square-kilometre (120 sq mi) municipality existed from 1926 until its dissolution in 1964. It was located in the eastern part of the present-day municipality of Tjeldsund in Troms og Finnmark county. The municipality surrounded the Grovfjorden. The administrative center of the former municipality was the village of Grov where Astafjord Church is located. The Astafjorden (strait) flowed along the northern part of the municipality and it was the namesake for the municipality.