Gloppen is a municipality in the county of Sogn og Fjordane, Norway. It is located in the traditional district of Nordfjord. Gloppen is generally subdivided into three areas: Hyen in the west, Gloppen in the center, and Breim in the east. Each of the areas have their own main service centres. Sandane, the administrative centre, is the largest with about 2,500 inhabitants. Other main villages include Byrkjelo, Re, and Straume. There are also some small villages including Kandal, Sjedu, and Egge.
On 1 January 1886, the sub-parish of Breim (population: 1,823) was separated from Gloppen. This left Gloppen with 2,970 residents. On 1 January 1964, the municipality of Breim (population: 1,731) was merged back into the municipality of Gloppen. After the merger, the population of Gloppen was 5,702. On 1 January 1965, the Hoplandsgrenda area (population: 42) was transferred to neighboring Stryn municipality.