Słupno [ˈswupnɔ] is a village in Płock County, Masovian Voivodeship, in east-central Poland.

The history of the village dates back to the 10th century, when a medieval Slavic stronghold was built at the site.

[2] In 1254, komes Żyro (local administration official) granted the village to the Płock Cathedral, and in 1443, Płock bishop Paweł Giżycki granted the village to archdeacon Ścibor.

[2][3] During the German occupation of Poland (World War II), Archbishop of Płock Antoni Julian Nowowiejski, and suffragan Bishop Leon Wetmański [pl], two of the 108 Blessed Polish Martyrs of World War II, were imprisoned in the village, before they were murdered in the Soldau concentration camp in 1941.

[4] In 1942 the Germans carried out a massacre of 25 Polish inhabitants of Słupno and nearby settlements.