Spirulina may refer to:
Biology Spirulina (genus), a genus of cyanobacteria (blue-green algae) Spirulina (dietary supplement), a cyanobacterium product and biomass that can be consumed by humans and other animals Arthrospira, a genus of cyanobacteria closely related to the Spirulina genus, with three species that make up the above dietary supplement, despite its name Spirulina (suborder), a group of cephalopods Spirula, the only extant member of that suborder
See also Spiralinella, a genus of very small sea snails, pyramidellid gastropod mollusks, or micromollusks Spirolina, a genus of foraminifera in the family Peneroplidae Spirurina, a suborder of nematode worms