Alston's cotton rat

{{Short description|Species of rodent}}

{{speciesbox

| status = LC | status_system = IUCN3.1

| status_ref = {{cite iucn|last= Patton |first=J. |last2=Weksler |first2=M. |last3=Delgado |first3=C. |last4=Rivas |first4=B. |last5=Aguillera |first5=M. |year=2016|page=e.T20210A115157557 |doi=10.2305/IUCN.UK.2016-3.RLTS.T20210A22355609.en|title=Sigmodon alstoni|errata=2017|access-date=14 June 2009}}

| genus = Sigmodon

| species = alstoni

| authority = Thomas, 1881

}}

Alston's cotton rat (Sigmodon alstoni) is a rodent species from South America. It is found in Brazil, Colombia, Guyana, Suriname, and Venezuela, where it inhabits lowland savannas.