Jadranka Kosor is a Croatian politician and former journalist who served as Prime Minister of Croatia from 2009 to 2011, having taken office following the sudden resignation of her predecessor Ivo Sanader. Kosor was the first and so far only woman to become Prime Minister of Croatia since independence.

The prime minister of Croatia, officially the president of the government of the Republic of Croatia, is Croatia's head of government, and is de facto the most powerful and influential state officeholder in the Croatian system of government. Following the first-time establishment of the office in 1945, the 1990–2000 semi-presidential period is the only exception where the president of Croatia held de facto executive authority. In the formal Croatian order of precedence, however, the position of prime minister is the third highest state office, after the president of the Republic and the speaker of the Parliament.