Altlandsberg is a town in Brandenburg, Germany. It is in the Märkisch-Oderland district. It is also 14 miles east of Berlin. The population was about 10,000 in 2020. There are six municipalities in the town. The largest political party is the SPD. Attractions include the Old Town ("Altstadt"). There is the town church St. Marien from the 13th century, a castle church from the 18th century, a town hall, a marketplace, a manor and historic barns ("Scheuneviertel") from the 19th century.