Ølen is a former municipality in the Vestlandet region of Norway. The municipality existed from 1916 until 2006, and originally it was a part of Hordaland county, but it was later transferred to Rogaland county prior to its dissolution. The municipality was located on the south side of the Bjoafjorden and east of the Ålfjorden. The administrative center of Ølen was the village of Ølensjøen. The municipality of Ølen makes up the northern part of the present-day municipality of Vindafjord in Rogaland county.