Grabów nad Prosną [ˈɡrabuf ˌnat ˈprɔsnɔ̃] is a town in Ostrzeszów County, Greater Poland Voivodeship, Poland, with about 1,900 inhabitants.

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Grabów nad Prosną
Town hall
Flag Coat of arms
Grabów nad Prosną
Coordinates: 51°30′N 18°7′E
Country	Poland
Voivodeship	Greater Poland
County	Ostrzeszów
Gmina	Grabów nad Prosną
Area
• Total	2.58 km2 (1.00 sq mi)
Population  (2016)
• Total	1,943
• Density	750/km2 (2,000/sq mi)
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)
Postal code	63-520
Vehicle registration	POT
Website	Official website

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Grabów was royal town of the Kingdom of Poland, administratively located in the Ostrzeszów County in the Sieradz Voivodeship in the Greater Poland Province.^[1]

Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, the town was occupied by Germany until 1945. In 1940, the occupiers renamed it Altwerder in attempt to erase traces of Polish origin.

• Teofil Ciesielski (1847-1916), botanist and beekeeper, professor of botany at the University of Lviv, director of the botanical garden in Lviv, one of the initiators and founders of Polish Copernicus Society of Naturalists
• Władysław Biegański (1857-1917), medical doctor, philosopher and social activist