The Asian country whose flag has a white crescent and star on a red background is Turkey.
Turkey’s national flag is a red field bearing a white crescent and five-pointed star positioned slightly left of center. In Turkish it is called Türk bayrağı, or “Turkish flag.” It is also known as Ay Yıldız, meaning “moon star,” and Al Bayrak, meaning “red flag.”
The design developed from the flag traditions of the Ottoman Empire. A related star-and-crescent flag was officially adopted by the Ottoman state in 1844, and the modern Turkish Republic retained the basic imagery. The Turkish Flag Law standardized the flag’s measurements, proportions, and shade of red on 29 May 1936.
The crescent and star are widely associated with Turkish and broader Islamic visual history, but the Turkish flag has its own specific national design and legal specifications. It is often confused with the flags of Pakistan, Algeria, and Tunisia, all of which also use a crescent and star. Their backgrounds and additional symbols make them distinct: Pakistan uses green and white, Algeria uses a vertical green-white split, and Tunisia has a white disc.