Ordosia

{{Italic title}}

{{Taxobox

|name = Ordosia

|fossil_range = Dresbachian{{cite journal

|last=Sepkoski

|first=Jack

|authorlink=Jack Sepkoski

|title=A compendium of fossil marine animal genera (Trilobita entry)

|journal=Bulletins of American Paleontology

|volume=363

|pages=1–560

|year=2002

|url=http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class

|accessdate=2008-01-12

|url-status=dead

|archiveurl=https://web.archive.org/web/20060905162524/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class

|archivedate=September 5, 2006

}}

|regnum = Animalia

|phylum = Arthropoda

|classis = Trilobita

|ordo = Corynexochida

|subordo = Leiostegiina

|superfamilia =

|genus = Ordosia

}}

Ordosia is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period.