Iocrinus

{{Short description|Extinct genus of crinoids}}

{{more citations needed|date=July 2023}}

{{Italic title}}

{{Taxobox

| name = Iocrinus

| fossil_range =

| image = Iocrinus subcrassus, crinoid, Late Ordovician, McMillan Formation, Butler County, Ohio, USA - Houston Museum of Natural Science - DSC01499.JPG

| image_caption = Iocrinus subcrassus

| regnum = Animalia

| phylum = Echinodermata

| classis = Crinoidea

| ordo = Disparida

| familia = Iocrinidae

| genus = Iocrinus

| genus_authority =

| subdivision_ranks = Species

| subdivision =

|}}

Iocrinus is an extinct genus of crinoid{{Cite web |date=2013-12-07 |title=Iocrinus |url=https://www.ordovicianatlas.org/atlas/echinodermata/crinoidea/disparida/iocrinidae/iocrinus/ |access-date=2023-06-26 |website=Atlas of Ordovician Life |language=en-US}} (sea lilies and feather stars). It is an early form of crinoid, from the Ordovician rock of North America, England, and Gilwern Hill, Powys in Wales.