Prosna [ˈprɔsna] is a village in the administrative district of Gmina Korsze, within Kętrzyn County, Warmian-Masurian Voivodeship, in northern Poland.

The village was first mentioned in 1376 by Winrich von Kniprode as property of the Leunenburg family.

[2] The manor house was initially built in 1610–1620 and restructured by the Polish brethren Jan Josef Gozdawa Naronowicz-Naronski in 1667–68.

A last major reconstruction happened in the 1860s in Neogothic style; the tower was added in 1875.

The manor was not destroyed throughout World War II but is ruined today.