Kielno is a village in the administrative district of Gmina Szemud, within Wejherowo County, Pomeranian Voivodeship, in northern Poland. It lies approximately 9 km south-east of Szemud, 18 km south of Wejherowo, and 22 km north-west of the regional capital Gdańsk. It is located within the historic region of Pomerania. Kielno was initially probably named Kolno. Kielno was a royal village of the Polish Crown, administratively located in the Gdańsk County in the Pomeranian Voivodeship. The local parish priest Zygmunt Niwicki was the royal secretary of 17th-century Polish kings. Here was born the Kashubian poet Alojzy Nagel.