Olsztyn District was a district within the

Duchy of Wieluń Duchy of Wieluń was a District duchy, district principality and a fiefdom within the Kingdom of Poland (1025–1385), Kingdom of Poland. It was formed in 1370 from part of the Kingdom of Poland, and existed until 1391 when it was incorporated back ...

. Its capital was Olsztyn. It was formed around 1378 from Wieluń Land and existed until 1391 when duchy was conquered by Kingdom of Poland. The city serves as a trade centre, with major rail and road connections, for the lake district. The Museum of Warmia and Mazury and a university are located in Olsztyn.

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{{Reflist Duchy of Wieluń 14th-century establishments in Poland 14th-century disestablishments in Poland States and territories established in the 1370s States and territories disestablished in 1391