Ostrzeszów District Okręg ostrzeszowski (Polish)
District of Duchy of Wieluń
Capital	Ostrzeszów
History
• Established	3 December 1378
• Conquest of Duchy of Wieluń by Kingdom of Poland	1391
Contained within
• Country	Duchy of Wieluń
Preceded by Succeeded by Wieluń Land Kingdom of Poland

Ostrzeszów District^[a] was a district within the Duchy of Wieluń. Its capital was Ostrzeszów. It was formed around 1378 from Wieluń Land and existed until 1391 when duchy was conquered by Kingdom of Poland.^[1]