Peruvian Oldfield mouse

{{Short description|Species of rodent}}

{{speciesbox

| name = Peruvian Oldfield mouse

| status = VU

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Pacheco, V. |author2=Barriga, C. |date=2018 |title=Thomasomys eleusis |volume=2018 |page=e.T21775A116323229 |doi=10.2305/IUCN.UK.2018-1.RLTS.T21775A116323229.en |access-date=12 November 2021}}

| genus = Thomasomys

| species = eleusis

| authority = Thomas, 1926

| synonyms =

}}

The Peruvian Oldfield mouse (Thomasomys eleusis) is a species of rodent in the family Cricetidae. It is found only in Peru.