Mustafa Suphi (1883 - 28 January 1921) was a Turkish communist leader.
Mustafa Suphi was born in 1883 in Giresun Province, in the Ottoman Empire, now located in present-day Turkey. He was educated in Jerusalem, Damascus and Erzurum before attending Galatasaray High School. He studied political science in Paris, where he was also a correspondent of the Turkish newspaper Tanin. He returned to Turkey in 1910, where he edited the newspaper Ifham. He also gave lectures on law and economics. In 1913 he was accused of involvement in the assassination of Mahmud Şevket Pasha and sentenced to fifteen years of exile in Sinop. Here he contributed articles about western philosophy to the periodicals Ictiha and Hak. However, in 1914 he escaped from Sinop and fled to Russia, where, following the outbreak of the First World War, Russian authorities regarded him as a prisoner of war and sent him into exile in the Ural region.
In 1915, whilst in the Urals he joined the Bolshevik Party. In July 1918, he helped organise the Congress of the Turkish Left Socialists, held in Moscow, and in November became involved in Muskom. He was also elected to the Central Committee of the All Russia Muslim Workers section of Narkomnats. He acted as Mirsäyet Soltanğäliev's secretary. He was chairperson of the Turkish Section of Eastern Publicity Bureau, and in 1919 attended the First Congress of the Third International as the delegate for Turkey. That year he also founded Yeni Dünya (New World), which he used to popularize the foundations of scientific socialism amongst Turkish POWs.