The Étang de Santa Giulia (Corsican: Stagnu di Santa Ghjulia) is a coastal lagoon in the Corse-du-Sud department of France.

It lies between the T10 highway and the sea, and is south of Porto-Vecchio.

It is fed at the south end by the Ruisseau de Punta Rossa Vignarellu and the smaller seasonal Ruisseau d'Alzellu.

[1] The Étang de Santa Giulia and land that surrounds it has been designated as a Zone naturelle d'intérêt écologique, faunistique et floristique (ZNIEFF), covering 61 hectares (150 acres).

[2] This is past of a larger 3.99 square kilometres (1.54 sq mi) Terrestrial Protected Area of land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy).