Gausdal is a municipality in Innlandet county, Norway. It is located in the traditional district of Gudbrandsdal. The administrative centre of the municipality is the village of Segalstad bru. Other villages in Gausdal include Follebu, Forset, and Svingvoll.

The 1,191-square-kilometre (460 sq mi) municipality is the 91st largest by area out of the 357 municipalities in Norway. Gausdal Municipality is the 156th most populous municipality in Norway with a population of 6,174. The municipality's population density is 5.2 inhabitants per square kilometre (13/sq mi) and its population has decreased by 1% over the previous 10-year period.

Logging, farming, and tourism are important industries in the municipality.

The parish of Gausdal was established as a civil municipality on 1 January 1838 (see formannskapsdistrikt law). On 1 January 1867, a small area of neighboring Øyer Municipality (population: 40) was transferred into Gausdal Municipality. In 1879, Gausdal Municipality was divided into two separate municipalities: Vestre Gausdal Municipality in the northwest (population: 2,362) and Østre Gausdal Municipality in the southeast (population: 5,911). On 27 July 1956, a small area of Sør-Fron Municipality (population: 7) was transferred to the neighboring Vestre Gausdal Municipality.

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1962, Vestre Gausdal Municipality (population: 2,590) and Østre Gausdal Municipality (population: 3,942) were merged to re-establish the old Gausdal Municipality which existed from 1838-1879 (the borders where similar, but not the same as the old Gausdal).

Historically, the municipality was part of the old Oppland county. On 1 January 2020, the municipality became a part of the newly-formed Innlandet county (after Hedmark and Oppland counties were merged).

The municipality (originally the parish) is named after the Gausdalen valley (Old Norse: Gausdalr) since the municipality is located in the valley. The first element is named after the river Gausa which flows through the valley. The river name comes from the verb gjósa which means to "gush", "burst out", or "stream forcefully". The last element is dalr which means "valley" or "dale".

The coat of arms was granted on 19 September 1986. The official blazon is "Per fess azure and argent, a single stair step section slanting outwards" (Norwegian: Delt av blått og sølv ved enkelt trappesnitt skrått utover). This means the arms have are divided with a line that is divided horizontally in the shape of a stairstep that is slanting to the right. The field (background) above the line has a tincture of blue. Below the line, the field has a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used. The arms were designed to mimic the shape of one of the main mountains in the municipality, Skeikampen. The bottom argent part represents the snowy mountain and the top blue part represents the sky. The arms were designed by Inger Line Thallaug. The municipal flag has the same design as the coat of arms.