Gonnesa is a town and comune located in the Province of Sulcis Iglesiente within the autonomous island region of Sardinia, Italy. It is situated in the Iglesiente subregion, approximately 60 kilometres (37 mi) west of Cagliari and about 14 kilometres (9 mi) northwest of Carbonia.
The municipality has a population of 4,456 inhabitants. It serves as a local administrative center within its specific geographic region of the island.