Borgholm Municipality is a municipality in Kalmar County, south-eastern Sweden, constituting the northern half of the island of Öland in the Baltic Sea. The municipal seat is located in the city of Borgholm.

Öland is the second-largest Swedish island and the smallest of the traditional provinces of Sweden. Öland has an area of 1,342 square kilometres and is located in the Baltic Sea just off the coast of Småland. The island has 26,000 inhabitants.