The national Flag of Nepal is one of only two non-rectangular official jurisdictional flags in the world (the other being the state flag of Ohio, USA). The flag is a simplified combination of two single pennants from different branches of the previous rulers, the Rana dynasty.

The flag was adopted, with the formation of a new constitutional government, on December 16, 1962. The individual pennants had been used for the preceding two centuries and the double pennant since the 19th century. The flag borrows the basic design from the original Hindu design, which has been in use for more than 2,000 years.