1974 Greek republic referendum in the context of "Kingdom of Greece (Wittelsbach)"

The Kingdom of Greece (Greek: Βασίλειον τῆς Ἑλλάδος, romanized: Vasíleion tis Elládos, pronounced [vaˈsili.on tis eˈlaðos]) was the Greek nation-state established in 1832 and was the successor state to the First Hellenic Republic. It was internationally recognised by the Treaty of Constantinople, where Greece also secured its full independence from the Ottoman Empire after nearly four centuries. It remained a Kingdom until 1924, when the Second Hellenic Republic was proclaimed, and from the Republic's collapse in 1935 to its dissolution by the Regime of the Colonels in 1973. A referendum following the regime's collapse in 1974 confirmed the effective dissolution of the monarchy and the creation of the Third Hellenic Republic. For much of its existence, the Kingdom's main ideological goal was the Megali Idea (Greek: Μεγάλη Ιδέα, romanized: Megáli Idéa, lit. 'Great Idea'), which sought to annex lands with predominately Greek populations.

King Otto of the House of Wittelsbach ruled as an absolute monarch from 1835 until the 3 September 1843 Revolution, which transformed Greece into a constitutional monarchy, with the creation of the Prime Minister as head of government, universal male suffrage and a constitution. A popular insurrection deposed Otto in 1862, precipitating the gradual collapse of the early Greek parties (English, French, Russian), which had dominated Greek politics.

The Greek royal family (Greek: Βασιλική Οικογένεια της Ελλάδος) was the ruling family of the Kingdom of Greece from 1863 to 1924 and again from 1935 to 1973. The Greek royal family is a branch of the Danish royal family, itself a cadet branch of the House of Glücksburg. The family had replaced the House of Wittelsbach that previously ruled Greece from 1832 to 1862. The first monarch was George I of Greece, the second son of King Christian IX of Denmark. The current head of the family is former Crown Prince Pavlos, who assumed the role on 10 January 2023 upon the death of his father, former King Constantine II.

With the 1974 Greek republic referendum and Article 4 of the Constitution of Greece, all family members have been stripped of their honorific titles and the associated royal status. Many family members born after 1974 still use the titles "Prince of Greece" and "Princess of Greece" to describe themselves, but such descriptions are neither conferred nor legally recognised by the Greek state as royal or noble titles. The family accepts that these terms are not royal titles, but rather personal identifiers.