Prime Minister of Greece Ioannis Metaxas suspends parliament and the Constitution and establishes the 4th of August Regime.

This is a list of the heads of government of the modern Greek state, from its establishment during the Greek War of Independence to the present day. Although various official and semi-official appellations were used during the early decades of independent statehood, the title of prime minister has been the formal designation of the office at least since 1843. On dates, Greece officially adopted the Gregorian calendar on 16 February 1923. All dates prior to that, unless specifically denoted, are Old Style.

Ioannis Metaxas was a Greek military officer and politician who was the dictator of Greece from 1936 until his death in 1941. He governed constitutionally for the first four months of his tenure, and thereafter as the strongman leader of the 4th of August Regime following his appointment by King George II.

The Parliament of the Hellenes, commonly known as the Hellenic Parliament, is the unicameral legislature of Greece, located in the Old Royal Palace, overlooking Syntagma Square in Athens. The parliament is the supreme democratic institution that represents the citizens through an elected body of Members of Parliament (MPs).

The Constitution of Greece was created by the Fifth Revisionary Hellenic Parliament in 1974, after the fall of the Greek junta and the start of the Third Hellenic Republic. It came into force on 11 June 1975 and has been amended in 1986, 2001, 2008 and 2019.

The 4th of August Regime, commonly also known as the Metaxas regime, was a dictatorial regime under the leadership of General Ioannis Metaxas that ruled the Kingdom of Greece from 1936 to 1941.