Prostyń

{{Infobox settlement

| name = Prostyń

| settlement_type = Village

| total_type =  

| image_skyline = Prostyń bazylika.JPG

| image_caption = Prostyń basilica

| image_flag =

| image_shield =

| image_map =

| subdivision_type = Country

| subdivision_name = {{POL}}

| subdivision_type1 = Voivodeship

| subdivision_name1 = Masovian

| subdivision_type2 = County

| subdivision_name2 = Ostrów Mazowiecka

| subdivision_type3 = Gmina

| subdivision_name3 = Małkinia Górna

| coordinates = {{coord|52|40|N|21|59|E|region:PL|display=title,inline}}

| pushpin_map = Poland

| pushpin_label_position = bottom

| elevation_m =

| population_total = 840

| website =

}}

Prostyń {{IPAc-pl|'|p|r|o|s|t|y|ń}} is a village in the administrative district of Gmina Małkinia Górna, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland.{{TERYT}} It lies approximately {{convert|6|km|mi|0|abbr=on}} south-west of Małkinia Górna, {{convert|16|km|mi|0|abbr=on}} south of Ostrów Mazowiecka, and {{convert|84|km|mi|0|abbr=on}} north-east of Warsaw.