Anna of Masovia (c. 1498 – after 26 January 1557 in Jaroslaw) was Princess of Mazovia and a member of the House of Piast. She was the last representative of the line of Masovian-Piast. She was the second daughter of Konrad III of Masovia and Anna Radziwiłł. She was a sister of Dukes Janusz III of Masovia and Stanislaus of Masovia, and Sophia, who married Stephen VII Báthory.