Eric III of Saxe-Bergedorf (mid 1330s – 1401) was the youngest son of Duke Albert IV of Saxe-Lauenburg and Beata of Schwerin (*?–before 1341*), daughter of Gunzelin VI, Count of Schwerin.

[1] In 1370 Eric III succeeded Albert V as Duke of Saxe-Bergedorf-Mölln, a highly indebted branch duchy of Saxe-Lauenburg.

So he pawned – in return for 16,262.5 Lübeck marks – all the remaining unencumbered parts of his branch duchy, to wit the Herrschaft of Bergedorf, the Vierlande, his half of the Saxon Wood and Geesthacht, to Lübeck.

[2] In 1386 Otto VI, Count of Tecklenburg-Schwerin gave permission to his cousin Eric III to claim in Otto's name the latter's inheritance of their late aunt Richardis' of Schwerin dower from the Danish King Valdemar Atterdag, protector of her dower since 1373.

Under Eric IV the two branch duchies merged again into a reunited Saxe-Lauenburg.