Marsberg (German: [ˈmaʁsˌbəʁk] ⓘ) is a town in the Hochsauerland district, in North Rhine-Westphalia, Germany.

Although its origins are obscure, Marsberg was a prospering town by the 13th century (it was even minting coins).

It was a free city until 1807, when it was incorporated into the Kingdom of Westphalia, until 1813.

After two years of independent government, it was added to Prussia in 1815.

It is situated on the river Diemel, approx.