Wejherowo [vɛi̯xɛˈrɔvɔ] ⓘ (Kashubian: Wejrowò; formerly German: Neustadt in Westpreußen) is a city in Gdańsk Pomerania, northern Poland, with 48,735 inhabitants (2021).

Wejherowo is located in Pomeralia, in the ethnocultural region of Kashubia, approximately 11 km (7 mi) west of the town of Rumia, 32 kilometres (20 miles) east of the town of Lębork and 35 km (22 mi) north-west of the regional metropole of Gdańsk, in the broad glacial valley of the river Rheda at an altitude of 30 metres (98 feet) above sea level.

According to the founder's will, the dwellers of the new settlement were to possess the same city rights as other towns in the region, hence the place granted Kulm law.

[4] During the Partitions, the German authorities led a systemic campaign of Germanization against local the Polish and Kashubian populations, which resisted by organizing the secret patriotic organization Zwiazek Filomatów, distributing the Polish newspaper Gazeta Gdańska, and by establishing various local economic initiatives.

Afterwards it was annexed by Nazi Germany and administered as part of Regierungsbezirk Danzig in the newly formed province of Reichsgau Danzig-West Prussia.

[5] The Einsatzkommando 16 and SS Wachsturmbann "Eimann" entered the county in the first half of September 1939 to commit various crimes against the population.

[10] Numerous Poles arrested during the Intelligenzaktion in other cities of the region were also briefly held in the local prison before they were murdered in Piaśnica.

Its first post-war mayor was Bernard Szczęsny, who during the German occupation was part of the Polish resistance movement, was imprisoned in the Stutthof concentration camp and escaped during a death march.