Jón Þorláksson was prime minister of Iceland from 8 July 1926 to 28 August 1927. He was the only leader of the Conservative Party (Íhaldsflokkurinn) which merged with the Liberal Party to form the Independence Party in 1929, and the Mayor of Reykjavík from 1933 to his death.

The prime minister of Iceland is head of government of the Republic of Iceland. The prime minister is appointed formally by the president and exercises executive authority along with the cabinet subject to parliamentary support.