Ion Dragoumis was a Greek diplomat, writer and nationalistic activist.
Dragoumis was born in Athens on September 2, 1878, the son of politician Stephanos Dragoumis who was Foreign Minister under Charilaos Trikoupis. He studied law at Athens University and, after 1899, entered the diplomatic branch of the Greek Foreign Ministry. In 1897, he enlisted in the Greek Army and fought in the Greco-Turkish War.
In 1902, Dragoumis was made Deputy Consul in the Greek consulate at Monastir (Vitolja). In 1903 he became head of the Consulate at Serres and later went on to serve in Philippoupolis (Plovdiv), Pyrgos (Burgas), Alexandria and Dede-Agach (Alexandroupolis). In 1907 he was assigned to the Embassy in Constantinople.
In 1915, Dragoumis resigned from the diplomatic corps and entered Greek politics as an independent. He was elected to Parliament from Florina. In that same year he was exiled to Corsica as a result of his disagreement with King Constantine I who refused to enter World War I eventhough the Bulgarian Army occupied a large part of eastern Macedonia.
On July 30, 1920 an assassination attempt was made against Venizelos at the train station of Lyon, France. On the very next day, July 31, Dragoumis was stopped by policemen loyal to Venizelos and was executed as an accomplice to the assassination attempt.