Megasphaeroceras

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{{Taxobox

|fossil_range = {{fossil range|Bajocian|ref={{cite journal|last=Sepkoski |first=Jack |title=A compendium of fossil marine animal genera (Cephalopoda entry) | journal=Bulletins of American Paleontology |volume=363 |pages=1–560 | year=2002 | url=http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class |accessdate=2017-10-18 |url-status=dead | archiveurl=https://web.archive.org/web/20160225225905/http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class | archivedate=2016-02-25 }}}}

|regnum = Animalia

|phylum = Mollusca

|classis = Cephalopoda

|subclassis = Ammonoidea

|ordo =

|superfamilia =

|familia = Sphaeroceratidae

|genus = Megasphaeroceras

}}

Megasphaeroceras is an ammonite genus included in Sphaeroceratidae, a family of ammonoid{{cite web | title= Paleobiology Database - Megasphaeroceras | year = | url = https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=15170| access-date = 2017-10-19 }} cephalopods characterized by their spheroidal shells with markedly eccentric coiling, fine ribbing, and complex sutures, known from the Bajocian.