Gjesdal is a municipality in Rogaland county, Norway. It is located in the traditional district of Jæren. The administrative centre of the municipality is the village of Ålgård. Other villages in Gjesdal include Dirdal, Frafjord, Gilja, Gjesdal, and Oltedal. The municipality lies about 25 kilometres to the southwest of the city of Stavanger in southwestern Norway.
The European route E39 highway runs through the western side of the municipality. On the east side of the municipality, the Frafjord Tunnel connects the Frafjord valley with the rest of the municipality.
The 618-square-kilometre municipality is the 187th largest by area out of the 356 municipalities in Norway. Gjesdal is the 95th most populous municipality in Norway with a population of 12,002. The municipality's population density is 21.5 inhabitants per square kilometre and its population has increased by 17.6% over the previous 10-year period.