Saudi National Day: Crown Prince (later king) Faisal of Saudi Arabia, on behalf of Ibn Saud, proclaims the unification of the Kingdom of Saudi Arabia, the current iteration of the Third Saudi State.

Saudi National Day is a public holiday in Saudi Arabia celebrated annually on 23 September to commemorate the proclamation that renamed the Kingdom of Nejd and Hejaz as the Kingdom of Saudi Arabia in 1932 through a royal decree by King Abdulaziz ibn Saud. It was founded in 1965 by King Faisal bin Abdulaziz in order to replace the Royal Seating Day, but at the same time letting it retain its predecessor's year count of 1930 instead of 1932. It was made a public holiday by King Abdullah bin Abdulaziz in 2005 and is one of the three non-religious holidays observed in the country, other being the Saudi Founding Day and Saudi Flag Day.

Faisal bin Abdulaziz Al Saud was King of Saudi Arabia from 1964 until his assassination in 1975. Before his ascension, he served as Crown Prince of Saudi Arabia from 1953 to 1964, and he was briefly regent to his half-brother King Saud in 1964. He was prime minister from 1954 to 1960 and from 1962 to 1975. Faisal was the third son of King Abdulaziz, the founder of modern Saudi Arabia.

Abdulaziz bin Abdul Rahman Al Saud, known in the Western world as Ibn Saud, was the founder and first king of Saudi Arabia, reigning from 23 September 1932 until his death in 1953. He had ruled parts of the kingdom since 1902, having previously been Emir, Sultan, and King of Nejd, and King of Hejaz.

Saudi Arabia, officially the Kingdom of Saudi Arabia (KSA), is a country in West Asia. Located in the centre of the Middle East, it covers the bulk of the Arabian Peninsula and has a land area of about 2,150,000 km² (830,000 sq mi), making it the fifth-largest country in Asia, the largest in the Middle East, and the twelfth-largest in the world. It is bordered by the Red Sea to the west; Jordan, Iraq, and Kuwait to the north; the Persian Gulf, Bahrain, Qatar and the United Arab Emirates to the east; Oman to the southeast; and Yemen to the south. The Gulf of Aqaba in the northwest separates Saudi Arabia from Egypt and Israel. Saudi Arabia is the only country with a coastline along both the Red Sea and the Persian Gulf, and most of its terrain consists of arid desert, lowland, steppe, and mountains. The capital and largest city is Riyadh; other major cities include Jeddah and the two holiest cities in Islam, Mecca and Medina. With a population of almost 32.2 million, Saudi Arabia is the fourth most populous country in the Arab world.