Saudi Flag Day is an annual holiday in the Kingdom of Saudi Arabia that celebrates the national flag of the country. It occasionally aligns with National Day, but its actual observance is on 11 Jumada Al Awal, the day the flag was first raised. Although it is not an official public holiday where businesses and schools close, it is widely recognized and celebrated with fervor and pride across the kingdom.

On Saudi Flag Day, the country is covered in green, the primary color of the Saudi flag. The national emblem, an image of a palm tree and two crossed swords, also brandishes the public space. This holiday fosters a sense of nationalism and unity amongst the Saudi public, offering an opportunity for citizens and residents to express their sentiments of love, loyalty, and affinity towards their nation.

Various activities associated with the flag are organized across the country, including flag raising ceremonies, cultural events, poetry recitals, and competitions. The government and private sector companies play an active role in celebrating this day, often illuminating buildings and streets with the national flag. The Saudi Flag Day serves as an opportunity to instil patriotism among the young generation and acknowledge the country's history, values, and identity.