The 1924 Estonian coup d'état attempt was a failed coup attempt in Estonia on 1 December 1924, conducted by the Comintern, and staged by the Communist Party of Estonia and Bolsheviks who in most part had been infiltrated from the Soviet Union. Of the 279 actively participating pro-communist rebels, 125 were killed in action, later more than 500 people were arrested. The Estonian government forces lost 26 men.

The Communist International (Comintern), also known as the Third International, was an international organization founded in 1919 that advocated world communism, and which was led and controlled by the Communist Party of the Soviet Union. The Comintern resolved at its Second Congress in 1920 to "struggle by all available means, including armed force, for the overthrow of the international bourgeoisie and the creation of an international soviet republic as a transition stage to the complete abolition of the state". The Comintern was preceded by the dissolution of the Second International in 1916. Vladmir Lenin and Leon Trotsky were both honorary presidents of the Communist International.