Orthosphinctes

{{Short description|Genus of molluscs (fossil)}}

{{Automatic taxobox

| fossil_range = {{fossil range|Kimmeridgian|ref={{cite web| last = Sepkoski| first = Jack| title = Sepkoski's Online Genus Database| author-link = | year = 2002| url = http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class| accessdate = 2014-05-28| archive-date = 2016-02-25| archive-url = https://web.archive.org/web/20160225225905/http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class| url-status = dead}}}}

| image = Gasteropods - Ammonites - Orthosphinctes sp. . .JPG

| image_caption = Orthosphinctes sp., from Montejunto (Portugal), at the Museu Nacional de História Natural, Lisboa

| taxon = Orthosphinctes

| authority = Schindewolf, 1925

| synonyms =

| subdivision_ranks = Species

| subdivision_ref = {{cite web | title= Paleobiology Database - Pectinatites |author-link =| year = | url = https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=15292 | access-date = 17 December 2021 }}

| subdivision = * Orthosphinctes alternans

}}

Orthosphinctes is a genus of ammonites belonging to the order Ammonitida family Ataxioceratidae.

They lived in the late Jurassic period, in the Kimmeridgian age, which occurred 155.7-152.1 million years ago. These shelled ammonoids were nektonic, fast-moving and carnivore.