Kurdistan flag day, the flag of Kurdistan was raised for the first time in Mahabad in eastern Kurdistan.

Kurdistan, or Greater Kurdistan, is a roughly defined geo-cultural region in West Asia wherein the Kurds form a prominent majority population and the Kurdish culture, languages, and national identity have historically been based. Geographically, Kurdistan roughly encompasses the northwestern Zagros and the eastern Taurus mountain ranges.

The flag of Kurdistan is the flag of Kurds and was created by the Society for the Rise of Kurdistan in 1920. It would later, in different variants, be adopted as the national flag of different Kurdish states including Republic of Ararat, Republic of Mahabad and most recently by Kurdistan Region in 1992. Moreover, the Kingdom of Kurdistan used the crescent flag which was also considered a Kurdish flag.

Mahabad is a city in the Central District of Mahabad County, West Azerbaijan province, Iran, serving as capital of both the county and the district.

December 17 is the 351st day of the year in the Gregorian calendar; 14 days remain until the end of the year.