沿阶草属（学名：Ophiopogon）是天门冬科下的一个属。该属共有约50余种，分布于亚洲东部及南部。

Ophiopogon (lilyturf) is a genus of evergreen perennial plants native to warm temperate to tropical east, southeast, and south Asia. Despite their grasslike appearance, they are not closely related to the true grasses Poaceae. The name of the genus is derived from Greek Όφις ophis, "snake", and πόγὦν pogon, "beard", most probably referring to its leaves and tufted growth. In the APG III classification system, it is placed in the family Asparagaceae, subfamily Nolinoideae (formerly the family Ruscaceae). Like many lilioid monocots, it was formerly classified in the Liliaceae.