Amelia of Masovia (pl: Amelia mazowiecka; 1397–98 – after 17 May 1434), was a Polish princess member from the Masovian branch of the House of Piast.
She was the fourth daughter of Siemowit IV, Duke of Masovia, and Alexandra, a daughter of Algirdas, Grand Duke of Lithuania, and sister of King Władysław II Jagiełło of Poland.