Otto Tief (14 August [O.S. 2 August] 1889 – 5 March 1976) was an Estonian politician, military commander (during the Estonian War of Independence), and a lawyer. Tief was the acting prime minister of the last government of Estonia before Soviet troops occupied Estonia in the Second World War in September 1944. Due to his commitment to his country, Tief is regarded by many of his fellow countrymen as a symbol of national resistance.