Nelson's giant deer mouse

{{Short description|Species of rodent}}

{{Speciesbox

| name = Nelson's giant deer mouse

| status = EN | status_system = IUCN3.1

| status_ref = {{cite iucn |author=Álvarez-Castañeda, S.T. |author2=Lacher, T. |author3=Vázquez, E. |author4=Arroyo-Cabrales, J. |author5=de Grammont, P.C. |date=2018 |title=Megadontomys nelsoni |volume=2018 |page=e.T12941A22353381 |doi=10.2305/IUCN.UK.2018-1.RLTS.T12941A22353381.en |access-date=12 November 2021}}

| genus = Megadontomys

| species = nelsoni

| authority = (Merriam, 1898)

| synonyms =

}}

Nelson's giant deer mouse (Megadontomys nelsoni) is a species of rodent in the family Cricetidae.

It is found only in Mexico.