Catherine Vasa of Sweden was a Swedish princess, and the Countess consort of East Frisia as the spouse of Edzard II, Count of East Frisia. She was the oldest daughter of Gustav Vasa and Margareta Leijonhufvud. She was the autonomous Regent of Berum and Norden in Ostfriesland from 1599 to 1610.

Edzard II was Count of East Frisia from 1561 to 1599. He was the son of Enno II of East Frisia and Anna of Oldenburg.