异叶南洋杉（拉丁语：Araucaria heterophylla）是南洋杉属下的一个物种，主要分布在诺福克岛和新喀里多尼亚。

树干直，高可达30公尺，枝条具韧性，抗风能力强，侧枝轮生，水平展开，幼叶呈针形，老枝鳞状叶呈三角状卵圆形。为雌雄异株或雌雄同株而异枝，雄花果为黄褐色，雌花果略近球形，成熟带有种子的雌果会掉下。

Araucaria heterophylla (synonym A. excelsa) is a member of the ancient and now disjointly distributed family Araucariaceae. As its vernacular name Norfolk Island pine implies, the tree is endemic to Norfolk Island, a small island in the Pacific Ocean between New Zealand and New Caledonia, about 1440km east of Sydney, Australia. The genus Araucaria occurs across the South Pacific, especially concentrated in New Caledonia (about 700 km due north of Norfolk Island) where 13 closely related and similar-appearing species are found. It is sometimes called a star pine, triangle tree or living Christmas tree, due to its symmetrical shape as a sapling, although it is not a true pine.