Catherine of Saxe-Lauenburg (Katarina in Swedish) (24 September 1513 – 23 September 1535) was the first consort of Gustav I of Sweden and Queen of Sweden from 1531 until her death in 1535. She was born in Ratzeburg to Magnus I, Duke of Saxe-Lauenburg and Catherine, daughter of Henry IV, Duke of Brunswick-Lüneburg.