池杉（学名：Taxodium ascendens）是杉科落羽杉属植物，亦称池柏、沼落羽松。

落叶乔木，高可达25米，树干通直，小枝直立。叶子钻形，长0.5－1厘米，紧贴小枝，向内弯曲，呈螺旋状排列；圆球形或近似卵形的球果，直径2.5厘米左右；盾形种鳞，顶端近似方形；种子为不等三角形，有厚的角棱。

Taxodium ascendens, also known as pond cypress, is a deciduous conifer of the genus Taxodium, native to North America. Many botanists treat it as a variety of bald cypress, Taxodium distichum (as T. distichum var. imbricarium) rather than as a distinct species, but it differs in ecology, occurring mainly in still blackwater rivers, ponds and swamps without silt-rich flood deposits. It predominates in cypress dome habitats.