:Simnia avena

{{Short description|Species of gastropod}}

{{Use dmy dates|date=August 2021}}

{{Speciesbox

| image = Naturalis Biodiversity Center - RMNH.MOL.187307 - Simnia avena (Sowerby, 1832) - Ovulidae - Mollusc shell.jpeg

| image_caption = Simnia avena

| taxon = Simnia avena

| authority = (Sowerby, 1832)

| synonyms_ref =

| synonyms = Neosimnia avena (Sowerby, 1832)

}}

Simnia avena is a species of sea snail, a marine gastropod mollusk in the family Ovulidae, the ovulids, cowry allies or false cowries.{{WRMS species|478412|Simnia avena (G.B. Sowerby II, 1832)|||Gofas, S. (2010). Simnia avena (G.B. Sowerby II, 1832). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=478412 on 5 June 2010}}