Sibyllonautilus

{{Taxobox

| fossil_range = {{fossil_range|247.2|221.5|mid -late Triassic}}

| image =

| regnum = Animalia

| phylum = Mollusca

| classis = Cephalopoda

| ordo = Nautilida

| familia = Tainoceratidae

| genus = Sibyllonautilus

| genus_authority = Diener, 1915

}}

Sibyllonautilus is an extinct genus of nautiloids from the Middle and Late Triassic. It is one of the last of the Tainoceratidae, a family of nautilids whose range begins much earlier in the Early Carboniferous (Mississippian).