Flags of the Ottoman Empire

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The Ottoman Empire used various flags and naval ensigns during its history. The crescent and star came into use in the second half of the 18th century. A buyruldu (decree) from 1793 required that the ships of the Ottoman Navy were to use a red flag with the star and crescent in white. In 1844, a version of this flag, with a five-pointed star, was officially adopted as the Ottoman national flag. The decision to adopt a national flag was part of the Tanzimat reforms which aimed to modernize the Ottoman state in line with the laws and norms of contemporary European states and institutions.

The star and crescent design later became a common element in the national flags of Ottoman successor states in the 20th century. The current flag of Turkey is essentially the same as the late Ottoman flag, but has more specific legal standardizations (regarding its measures, geometric proportions, and exact tone of red) that were introduced with the Turkish Flag Law on 29 May 1936. Before the legal standardization, the star and crescent could have slightly varying slimness or positioning depending on the rendition.