Saudi National Day (Arabic: اليوم الوطني للمملكة العربية السعودية al-Yawm al-Waṭanī lil-Mamlaka al-ʿArabiyya as-Saʿūdiyya) 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.

[1] 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.

[3][4] King Abdulaziz was able to conquer the oases of Riyadh in 1902; and al-Hasa in 1913, and by 1925, he unified both Nejd and the Hejaz after defeating the forces of Sharif Hussein.

Saudi National Day[5] is celebrated with folk dances, songs, and traditional festivities.

Roads and buildings are decorated with Saudi flags, and people wear the national colours of green and white, and display balloons in the same.