Albert IV of Saxe-Lauenburg
Albert IV of Saxe-Lauenburg (1315–1343) was the eldest son of Duke John II and Elisabeth of Holstein-Rendsburg. In 1321 he succeeded his father as duke of the Saxe-Bergedorf-Molln branch of Saxe-Lauenburg, ruling first under his mother's regency.
In 1334 Albert married Beata of Schwerin, and after her death married Sophia of Werle-Gustrow in 1341. His three sons by Beata, John III, Albert V and Eric III, later ruled the branch duchy in turn. Albert died in 1343.