Allognathus graellsianus

{{Short description|Species of gastropod}}

{{Use dmy dates|date=March 2020}}

{{Speciesbox

| image = Allognathus graellsianus shell.jpg

| image_caption = Apertural view of the shell of Allognathus graellsianus

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Gómez Moliner, B.J. |date=2011 |title=Allognathus graellsianus |volume=2011 |page=e.T877A13088057 |doi=10.2305/IUCN.UK.2011-1.RLTS.T877A13088057.en |access-date=14 November 2021}}

| taxon = Allognathus graellsianus

| authority = (Pfeiffer, 1853)

| synonyms = *Helix grateloupi Graells, 1846

• Helix graellsiana Pfeiffer, 1848

}}

Allognathus graellsianus is a species of land snail in the family Helicidae, the true snails. It is endemic to Mallorca, one of Spain's Balearic Islands. This taxa is the type species of the genus Allognathus.

The snail lives in cracks in rocks and walls and is only active when it rains.