Half-collared sparrow

{{Short description|Species of bird in Brazil}}

{{speciesbox

| image = Arremon semitorquatus -Piraju, Sao Paulo, Brazil-8.jpg

| image_caption = In Piraju, São Paulo, Brazil

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=BirdLife International |date=2018 |title=Arremon semitorquatus |volume=2018 |page=e.T22729332A132033488 |doi=10.2305/IUCN.UK.2018-2.RLTS.T22729332A132033488.en |access-date=12 November 2021}}

| genus = Arremon

| species = semitorquatus

| authority = Swainson, 1838

| synonyms =

| range_map = Arremon semitorquatus map.svg

}}

The half-collared sparrow (Arremon semitorquatus) is a species of bird in the family Passerellidae.

It is endemic to southeastern Brazil.

Its natural habitats are subtropical or tropical moist lowland forest and heavily degraded former forest.