Mikoszewo [mikɔˈʂɛvɔ] (former German name: Nickelswalde) is a village in the administrative district of Gmina Stegna, within Nowy Dwór Gdański County, Pomeranian Voivodeship, in northern Poland.

Mikoszewo is where the longest Polish river, Vistula, empties into the Baltic Sea.

Following the German defeat in World War I, it was part of the Free City of Danzig from 1920 to 1939.

During the war, it was the location of a sub-camp of the Stutthof concentration camp, in which the Germans imprisoned 120 Norwegians as forced labor.

[3] Following Germany's defeat in World War II, under border changes promulgated at the Potsdam Conference of July–August 1945, the area became part of Poland.