石松属（学名：Lycopodium）是石松科中的一属，无花，有维管束，陆生或附生；茎为多分枝、直立、平卧或匍匐；叶小，简单，针状或鳞状，且浓密地覆盖住茎及支干。叶中有单一、无分支的维管束，称做小叶。孢子囊为肾形，之中的孢子为同形孢子，长在直立茎末端呈锥状的叶子（孢子叶）的叶片上缘。

扁枝石松属（Diphasiastrum）、小石松属（Lycopodiella）及石杉属（Huperzia）曾被归类于石松属中，但现在皆分别分成了不同的属。还有一些学者分出很多的属来，如包含玉柏的 Dendrolycopodium　及包含杉叶蔓石松的 Spinulum。

Lycopodium (from Greek lukos, wolf and podion, diminutive of pous, foot) is a genus of clubmosses, also known as ground pines or creeping cedar, in the family Lycopodiaceae, a family of fern-allies (see Pteridophyta). They are flowerless, vascular, terrestrial or epiphytic plants, with widely branched, erect, prostrate or creeping stems, with small, simple, needle-like or scale-like leaves that cover the stem and branches thickly. The leaves contain a single, unbranched vascular strand and are microphylls by definition. The kidney-shaped or reniform spore-cases (sporangia) contain spores of one kind only (isosporous, homosporous) and are borne on the upper surface of the leaf blade of specialized leaves (sporophylls) arranged in a cone-like strobilus at the end of upright stems. The club-shaped appearance of these fertile stems gives the clubmosses their common name.