Altlandsberg (German: [ˈaltlantsˌbɛʁk] ⓘ) is a historic town in the district of Märkisch-Oderland, in Brandenburg, Germany.

Altlandsberg was first mentioned in a 1230 deed, it was located at the site of a former Slavic (Sprevane) settlement.

The city was laid out at the behest of the Ascanian rulers, their successor Margrave Louis I from the Bavarian House of Wittelsbach even established a monastery of the Servite Order in 1335, which was dissolved during the Protestant Reformation.

Altlandsberg was devastated by the Hussites in 1432, it was affected by several town fires and plague epidemics in the 16th century.

A hoard of 7450 gold and silver coins dating from the 14th and early 15th century was discovered in the grounds of the former manor in late 2016.