Albert of Saxe-Wittenberg (German: Albrecht von Sachsen-Wittenberg; died 28 June 1385 in Wittenberg) was born as the son of Otto (d. 30 March 1350), a younger son of the prince-elector Rudolf I of Saxe-Wittenberg, and his (Otto's) wife Elisabeth, daughter of Duke William II of Brunswick-Lüneburg.

A further reason may be found in the terms of the Brunswick-Lüneburg investiture agreement of 1235 as well as the succession treaties agreed by William's father Otto the Strict with Brunswick-Lüneburg's Wolfenbüttel line of the House of Welf, according to which the principality had to be passed to any male heir within the entire Welf house if there were one.

It was agreed that the land would belong, undivided, to the two Ascanians from Saxe-Wittenberg and, after their deaths, would be transferred to the sons of the fallen duke, Magnus II.

In order that this plan could also be reinforced by family ties, in 1374 Albert of Saxe-Lüneburg married the widow of Magnus II, Catharina and chose Celle as his home, which he made a residence in 1378.

Albert married Catherina, daughter of Bernhard III, Prince of Anhalt-Bernburg, widow of Magnus II, Duke of Brunswick-Lüneburg.