Castrillo de la Guareña

{{refimprove|date=April 2024}}

{{Infobox settlement

| official_name = Castrillo de la Guareña

| nickname =

| image_flag = Bandera de Castrillo de la Guareña.svg

| image_shield = Escudo de Castrillo de la Guareña.svg

| pushpin_map = Spain

| image_skyline = Castrillo de la Guareña 03 by-dpc.jpg

| pushpin_map_caption = Spain

| subdivision_type = Country

| subdivision_name = {{ESP}}

| subdivision_type1 = Autonomous community

| subdivision_name1 = {{flag|Castile and León}}

| subdivision_type2 = Province

| subdivision_name2 = {{flag|Province of Zamora|name=Zamora}}

| subdivision_type3 = Comarca

| subdivision_name3 = La Guareña

| leader_title = Mayor

| leader_name = Ana María González Santos

| area_magnitude =

| area_total_km2 = 21.91

| area_land_km2 =

| area_water_km2 =

| elevation_m =

| population_demonym = Castrillejos

| population_as_of = {{Spain metadata Wikidata|population_as_of}}

| population_footnotes = {{Spain metadata Wikidata|population_footnotes}}

| population_total = {{Spain metadata Wikidata|population_total}}

| population_density_km2 =auto

| timezone = CET

| utc_offset = +1

| timezone_DST = CEST

| utc_offset_DST = +2

| coordinates = {{coord|41|13|49|N|5|19|25|W|display=inline}}

| website =

| footnotes =

| }}

Castrillo de la Guareña is a municipality located in the province of Zamora, Castile and León, Spain.