Mestwinowo

{{Infobox settlement

| name = Mestwinowo

| settlement_type = Settlement

| total_type =  

| image_skyline =

| image_caption =

| image_flag =

| image_shield =

| image_map =

| subdivision_type = Country

| subdivision_name = {{POL}}

| subdivision_type1 = Voivodeship

| subdivision_name1 = Pomeranian

| subdivision_type2 = County

| subdivision_name2 = Kościerzyna

| subdivision_type3 = Gmina

| subdivision_name3 = Liniewo

| coordinates = {{coord|54|2|58|N|18|18|35|E|region:PL|display=title,inline}}

| pushpin_map = Poland

| pushpin_label_position = right

| timezone = CET

| utc_offset = +1

| timezone_DST = CEST

| utc_offset_DST = +2

| elevation_m =

| population_as_of = 2022

| population_total = 10

| area_code_type = Number Zone

| area_code = (+48) 58

| registration_plate = GKS

| website =

}}

Mestwinowo {{IPAc-pl|m|e|s|t|f|i|'|n|o|w|o}} is a settlement in the administrative district of Gmina Liniewo, within Kościerzyna County, Pomeranian Voivodeship, in northern Poland.{{cite web |url=http://www.stat.gov.pl/broker/access/prefile/listPreFiles.jspa |title=Central Statistical Office (GUS) - TERYT (National Register of Territorial Land Apportionment Journal) |date=2008-06-01 |language=Polish}} It lies approximately {{convert|7|km|mi|0}} south-east of Liniewo, {{convert|23|km|mi|0|abbr=on}} east of Kościerzyna, and {{convert|42|km|mi|0|abbr=on}} south-west of the regional capital Gdańsk. It is located within the historic region of Pomerania.

During the German occupation of Poland (World War II), in October 1939, the SS and Selbstschutz murdered 46 Polish farmers from Jaroszewy in the village, after they were previously deceitfully gathered for a formal meeting in their home village.{{cite book|last=Wardzyńska|first=Maria|year=2009|title=Był rok 1939. Operacja niemieckiej policji bezpieczeństwa w Polsce. Intelligenzaktion|language=pl|location=Warsaw|publisher=IPN|pages=154–155}}