Promachocrinus is a genus of free-swimming, stemless crinoids.

It was a monotypic genus, with the only species in the genus being Promachocrinus kerguelensis, until the discovery of four new species, establishment of two others previously described and the transfer of another species to the genus in 2023.

[2] Known for being coldwater crinoids, members of Promachocrinus are typically found in the seas around Antarctica and surrounding island groups, including under the sea ice.

Many of the species are circum-Antarctic and can be difficult to tell apart without DNA sequencing.

[4] There are eight accepted species of Promachocrinus as of August 2023: