Konstantinos Maniadakis (Greek: Κωνσταντίνος Μανιαδάκης; 25 July 1893, in Sofiko, Corinthia – Athens, 28 February 1972) was a Greek Army officer and politician who became notorious as head of the internal security services of the dictatorial 4th of August Regime (1936–1941). A career engineers officer, Maniadakis resigned from the army in 1929. In 1936, dictator Ioannis Metaxas appointed him to head the Under-Ministry of Public Security. During his tenure, he managed to almost completely suppress and disorganize the Communist Party of Greece, imprisoning hundreds of its members and even publishing a government-controlled rival version of the party's newspaper, Rizospastis. He was assisted by Heinrich Himmler in the persecution of Communism, and was regarded to be highly efficient. Following the German invasion of Greece, he continued in office in the early months of the Greek government in exile as Interior Minister, but was soon forced to resign. After World War II, he was elected several times to the Hellenic Parliament.