Waldemar I, Prince of Anhalt-Zerbst

Waldemar I (died in 1368) was an Ascanian prince of Anhalt-Zerbst, youngest son of Albert I and Agnes of Brandenburg. After his father died in 1316, he and his brother Albert II were raised by their maternal uncle, Margrave Waldemar of Brandenburg, and on coming of age ruled the principality jointly, Waldemar holding his court at Dessau.

In 1344 he married Elisabeth of Saxe-Wittenberg. When Albert II died in 1362, Waldemar continued as co-ruler with his nephew John II. At his death he was succeeded by his son Waldemar II.