Anna Catherine Constance Vasa (; 7 August 1619 – 8 October 1651) was a Polish princess by birth and the Hereditary Countess Palatine of Neuburg by marriage.

Early life and ancestry Born into the House of Vasa, ruling family of the Kingdom of Poland, Anna Catherine Constance was the daughter of King Sigismund III Vasa by his second wife, Constance of Austria.

Life After the successive deaths of her mother (1631) and father (1632), and in order to secure her upkeeping according to her rank, in 1632 the parliament bestowed her with the counties of Brodnickie, Gołubskie and Tucholskie, which previously had belonged to her mother; however, she only came into possession of them when she came of age in 1638.S. Ochmann-Staniszewska: Dynastia Wazów w Polsce (The Vasa dynasty in Poland), PWN, Warsaw 2007, pp. 165-167.

Since 1637, a marriage was suggested between Anne Catherine Constance and Ferdinand Charles, Archduke of Austria, heir of Tyrol and nephew of Ferdinand II, Holy Roman Emperor. Despite arrangements in 1639 and 1642, the marriage never actually took place, because of the age of Ferdinand Charles and because of disagreement about the amount of dowry.

Frederick William, Elector of Brandenburg, and Gaston, Duke of Orléans (brother of King Louis XIII), were also candidates for her hand. However, Anne Catherine Constance finally married Philip William, heir of the Count Palatine of Neuburg and later Elector Palatine, in Warsaw on 8 June 1642.Zygmunt Wdowiszewski: Genealogia Jagiellonów i Domu Wazów w Polsce (Genealogy of the Jagiellonian dynasty and the House of Vasa in Poland), Kraków 2005, p. 236. She brought a considerable dowry in jewels and cash, calculated at a total of 2 million thalers. On 18 July 1645 she gave birth her only child, a son, who died the same day.Complete Genealogy of the House of Wittelsbach (Retrieved 17 June 2014).

Death Anna Catherine Constance died childless in Cologne, aged 32, and was buried in the church of the Jesuits in Düsseldorf.

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