The prime minister of Iran was a political post that had existed in Iran (Persia) during much of the 20th century. It began in 1906 during the Qajar dynasty and into the start of the Pahlavi dynasty in 1923 and into the 1979 Iranian Revolution before being abolished in 1989.

The Qajar dynasty was an Iranian dynasty founded by Mohammad Khan of the Qoyunlu clan of the Turkoman Qajar tribe.