The Malvinas Basin (Spanish: Cuenca de Malvinas) is a major sedimentary basin in the Argentine Shelf offshore southern Patagonia.

The basin borders to the west with the Río Chico-Dungeness High that separates it from the Magallanes Basin.

[2] Contrary to the neighbouring North Falkland and Magallanes Basins, the Malvinas Basin is not known to have commercial hydrocarbon reserves.

[3] The Malvinas Basin started to form with the break-up of Pangea since the Early Jurassic.

Though poorly understood due to the lack of well data, several formations were identified in the basin on the basis of 2D seismic, of which some also crop out in onshore Patagonia and the Austral Basin:[4]