Karna [ˈkarna] is a village in the administrative district of Gmina Siedlec, within Wolsztyn County, Greater Poland Voivodeship, in west-central Poland.

The town was formed in the Middle Ages and has existed since at least the 13th century.

Mentioned in 1238 in a Latin document as Carna, 1238 Tamo, 1400 Karna.

Among the muddy meadows, on the Szarka, to the northeast, near the village, archaeologists found the remains of a two-part concave settlement with an internal diameter of approx.

Stefan Chmielewski: Słownik historyczno-geograficzny województwa poznańskiego w średniowieczu, cz.