Zuiderduintjes (Dutch pronunciation: [ˈzœydərˌdœyɲtɕəs]; English: Little Southern Dunes) is an uninhabited island in the Wadden Sea in the Netherlands.

It is situated south of Rottumeroog, east of Rottumerplaat, and west of Borkum.

Zuiderduintjes is part of the nature reserve Rottum and access to the island is prohibited.

Access to the island is prohibited since it is a resting and foraging area for birds and seals.

[1] The island has a dune and salt marsh vegetation, and its plants include Elytrigia juncea subsp.