Anna Katherina Konstanzia Vasa; Polish: Anna Katarzyna Konstancja Waza (7 August 1619 in Warsaw – 8 October 1651 in Cologne) was a Polish princess, daughter of King Sigismund III Vasa and his second spouse Constance of Austria. She was therefore the half-sister of King Władysław IV Vasa.
Anna Katherina Konstanzia Vasa was 11 when Grantville arrived in 1631. In January of 1634, she was briefly considered as a possible wife for Don Fernando, but her youth and early death in the OTL weighed against her. However Francisco Nasi did not consider those factors when, in conversation with Mike Stearns and Ed Piazza, he speculated that Ferdinand III of Austria-Hungary might consider Anna as a possible wife for his brother Leopold, as he thought that Ferdinand would want some connection with the Polish Vasas.
