Bakke is a former municipality in Vest-Agder county, Norway. The 244-square-kilometre (94 sq mi) municipality existed from 1838 until its dissolution in 1965. It was located in the present-day municipalities of Sirdal and Flekkefjord. It included the whole Sirdalen valley along the Rogaland county border, stretching from the Aust-Agder county border in the north to Sirnes and the lake Lundevatnet in the south. The administrative center was the village of Sira where Bakke Church is located.

Vest-Agder was one of 18 counties (fylker) in Norway up until 1 January 2020, when it was merged with Aust-Agder to form Agder county. In 2016, there were 182,701 inhabitants, around 3.5% of the total population of Norway. Its area was about 7,277 square kilometres (2,810 sq mi). The county administration was located in its largest city, Kristiansand.