Donald Franciszek Tusk ( listen) (born April 22, 1957, Gdańsk) is a center-right Polish politician, co-founder and chairman of the Civic Platform (Platforma Obywatelska), and the Prime Minister of the Republic of Poland.

Tusk was officially designated as Prime Minister on November 9, 2007 and took office on November 16. His cabinet won the vote of confidence in the Sejm on November 24, 2007.

Tusk was one of several vice-speakers of the Sejm (2001-2005), the lower house of the Polish parliament. Prior to co-founding Civic Platform in 2001, he was a prominent member of the Liberal Democratic Congress (Kongres Liberalno-Demokratyczny) and the Freedom Union (Unia Wolności). He quit the Freedom Union after he failed to win the party's chairmanship in a race against Bronisław Geremek.