Gigantopygus

{{italic title}}{{Taxobox

|name = Gigantopygus

|fossil_range = Early Botomian{{cite journal

|last=Sepkoski

|first=Jack

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

|journal=Bulletins of American Paleontology

|volume=364

|page=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=2006-09-05

}}

|regnum = Animalia

|phylum = Arthropoda

|classis = Trilobita

|ordo = Redlichiida

|subordo = Redlichiina

|superfamilia = Redlichioidea

|familia = Gigantopygidae

|familia_authority = Harrington, 1959

|genus = Gigantopygus

|genus_authority = Hupé, 1953

|type_species = Gigantopygus papillatus

| subdivision_ranks = Species

| subdivision =

• G. angustalatus Hupé, 1954
• G. papillatus Hupé, 1953
• G. bondoni Hupé, 1954

}}

Gigantopygus is an extinct genus of redlichiid trilobites. It lived during the early part of the Botomian stage, a faunal stage during the Early Cambrian, which lasted from approximately 524 to 518.5 million years ago. Fossils are found in Morocco and Spain