Saudi Arabia's National Day, or locally known as Al-Yaom-ul-Watany is celebrated on September 23rd. This day marks the unification of the country as a kingdom and the birth of the Kingdom of Saudi Arabia.
The Twenty three of S-e-p serves as Saudi Arabia's National Day. King Abdulaziz announced the nation's unification as a kingdom and changed its name from the Kingdom of Najd and Hijaz to the Kingdom of Saudi Arabia