Polish National Department (PND, Polish: Wydział Narodowy Polski, WNP) was a major organization of Polish-American Polonia in United States around and after World War I. It organized relief for war-torn and newly independent Second Polish Republic. Prominent activists included world-famous pianist and future prime minister of Poland, Ignacy Jan Paderewski.
PND was aligned to Polish endecja faction of Roman Dmowski, and opposed to Committee of National Defense (CND, Komited Obrony Narodowej, KON), aligned to Józef Piłsudski's faction.