贝母兰属（学名：Coelogyne）是兰科下的一个属，为附生兰或陆生兰。该属共有近200种，分布于热带亚洲至大洋洲。

附生草本。根状茎常延长，匍匐或多少悬垂，通常具较密生的节，节上被鳞片状鞘。假鳞茎常较粗厚，以一定距离着生于根状茎上，基部常被箨状鞘，顶端生 (1-) 2枚叶。叶通常长圆形至椭圆状披针形，一般质地较厚，基部具柄。花葶生于假鳞茎顶端，常与幼叶同时出现于幼嫩假鳞茎顶端，初时发自近老假鳞茎基部的根状茎上，有时在花葶基部或上部近花序轴处具多枚二列套叠的、宿存的革质颖片；总状花序直立或俯垂，通常具数朵花，较少超过20朵或减退为单花的；花苞片常较大，近舟状，对折，脱落；花较大或中等大，常白色或绿黄色，唇瓣多有斑纹；萼片相似，有时背面有龙骨状突起；花瓣常为线形，较少与萼片近等宽；唇瓣常以狭窄的基部着生于蕊柱基部，3裂或罕有不裂；侧裂片直立并多少围抱蕊柱；唇盘上有2-5条纵褶片或脊，后者常分裂或具附属物；蕊柱较长，上端两侧常具翅，翅可围绕蕊柱顶端，无蕊柱足；花药内倾；花粉团4个，成2对，蜡质，附着于1个粘质物上；柱头凹陷；蕊喙较大。蒴果中等大，常有棱或狭翅。

Coelogyne Lindl. 1821, is a genus of over 200 sympodial epiphytes from the family Orchidaceae, distributed across India, China, Indonesia and the Fiji islands, with the main centers in Borneo, Sumatra and the Himalayas. They can be found from tropical lowland forests to montane rainforests. A few species grow as terrestrials or even as lithophytes in open, humid habitats. The genera Bolborchis Lindl., Hologyne Pfitzer and Ptychogyne Pfitzer are generally included here. The genus is abbreviated Coel in trade journals.