Spinulum is a genus of club mosses in the family Lycopodiaceae.

In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is placed in the subfamily Lycopodioideae.

[1] Some sources do not recognize the genus, sinking it into Lycopodium.

[2] Spinulum annotinum is widespread in the temperate Northern Hemisphere.

[2] As of June 2024[update], the Checklist of Ferns and Lycophytes of the World recognized two species:[3]