东龙洲又名东龙岛（英文：Tung Lung Island），是香港西贡区最南端的岛屿，位于清水湾半岛以南，香港岛小西湾之东南，岛屿面积达2.42平方公里。

由于东龙洲位于佛堂门以南，古时被称为南佛堂或者南堂岛。岛屿西南的南堂海峡（今多写作蓝塘海峡）也是因为南堂岛的名称而得名。另一方面，其北部的海峡被称为佛堂门，后来因为填海关系，佛堂门以北的佛堂洲（北佛堂）已经与清水湾半岛连陆。

东龙洲上设有东龙岛炮台特别地区，内有东龙洲炮台遗址；亦是渔农自然护理署的指定露营地点之一，最少可以容纳7个露营单位。

从东龙洲西北面的海域东望东龙洲

Tung Lung Chau (Chinese:东龙洲; literally: "eastern dragon island"), also known as Nam Tong Island (南堂岛) is an island located off the tip of the Clear Water Bay Peninsula in the New Territories of Hong Kong. It is also referred by Hong Kong people as Tung Lung To or Tung Lung Island (东龙岛). The island is largely uninhabited. Administratively, it belongs to Sai Kung District.