The national flag of Turkey, officially the Turkish flag, is a red flag featuring a white star and crescent from its emblem which was the prominent symbol of the Ottoman Empire, and in contemporary times used as a national symbol for some countries, and a recognized symbol of Islam however it does not exist as a religional mean in the Turkish flag. The flag is often called "the red flag", and is referred to as "the red banner" in the Turkish national anthem. The measures, geometric proportions, and exact tone of red of the flag of Turkey were legally standardized with the Turkish Flag Law on 29 May 1936.

A national flag is a flag that represents and symbolizes a given nation. It is flown by the government of that nation, but can also be flown by its citizens. A national flag is typically designed with specific meanings for its colours and symbols, which may also be used separately from the flag as a symbol of the nation. The design of a national flag is sometimes altered after the occurrence of important historical events. The burning or destruction of a national flag is a greatly symbolic act.