Władysław IV Vasa or Ladislaus IV (9 June 1595 – 20 May 1648) was King of Poland, Grand Duke of Lithuania and claimant of the thrones of Sweden and Russia. Born into the House of Vasa as a prince of Poland and of Sweden, Władysław IV was the eldest son of Sigismund III Vasa and his first wife, Anna of Austria.
Władysław was elected as the tsar of Russia by the Seven Boyars in 1610, when the Polish army captured Moscow, but did not assume the throne because of his father's position and a popular uprising. Nevertheless, until 1634, he used the titular title of grand duke of Moscow.