银杉（学名：Cathaya argyrophylla）是松科银杉属（拉丁语：Cathaya），为中国特产的稀有树种。

常绿乔木，高可达20米，枝平列，小枝有毛。叶两型，生长枝上的叶放射状散生，长4～5厘米；短枝上的叶轮生，长不到2.5厘米，线形，下面有白色气孔带。长椭圆卵形球果，长3～5厘米，圆形至卵圆形种鳞。有13～16个，长1.5～2.5厘米，上面有两个种子，有长椭圆形薄翅。

Cathaya is a genus in family Pinaceae and has one known living species, Cathaya argyrophylla. Cathaya is a member of the subfamily Laricoideae, most closely related to Pseudotsuga and Larix. A second species, C. nanchuanensis, is now treated as a synonym, as it does not differ from C. argyrophylla in any characters.