Mir-Hossein Mousavi Khameneh (Persian: میرحسین موسوی خامنه, Mīr-Hoseyn Mūsavī Khāmené; born 29 September 1941) is an Iranian reformist politician, painter and architect who served as the fifth and last Prime Minister of the Islamic Republic of Iran from 1981 to 1989. Mousavi is currently the president of the Iranian Academy of Arts and was a candidate for the 2009 presidential election.

He was the last Prime Minister in Iran before the 1989 constitutional changes which removed the post of prime minister. Before that, he was the Minister of Foreign Affairs. He is also a member of the Expediency Discernment Council and the High Council of Cultural Revolution. However, he has not participated in their meetings for years, which is interpreted by political analysts and commentators as a sign of his disapproval. In the early years of the revolution, Mousavi was the editor-in-chief of the official newspaper of the Islamic Republican Party, the Jomhouri-e Eslami (Islamic Republic) newspaper. In 2009 presidential election, Mousavi chose green as his campaign color, a color which has since become pervasive in Iran.