The national flag of Bhutan (Dzongkha: ཧྥ་རན་ས་ཀྱི་དར་ཆ་; Wylie: hpha-ran-sa-kyi dar-cho) is one of the national symbols of Bhutan. The flag is based upon the tradition of the Drukpa Lineage of Tibetan Buddhism and features Druk, the Thunder Dragon of Bhutanese mythology. The basic design of the flag by Mayum Choying Wangmo Dorji dates to 1947. A version was displayed in 1949 at the signing of the Indo-Bhutan Treaty. A second version was introduced in 1956 for the visit of Druk Gyalpo Jigme Dorji Wangchuk to eastern Bhutan; it was based upon photos of its 1949 predecessor and featured a white Druk in place of the green original.

The Bhutanese subsequently redesigned their flag to match the measurements of the flag of India, which they believed fluttered better than their own. Other modifications such as changing the red background color to orange led to the current national flag, in use since 1969. The National Assembly of Bhutan codified a code of conduct in 1972 to formalize the flag's design establish protocol regarding acceptable flag sizes and conditions for flying the flag.

Coordinates: 27°25′01″N 90°26′06″E / 27.417°N 90.435°E / 27.417; 90.435

Bhutan (Dzongkha: འབྲུག་ཡུལ་, tr ʼbrug-yul, "Druk Yul"; Devanagari भूटान, Bhūṭān), officially the Kingdom of Bhutan, is a landlocked state in South Asia, located at the eastern end of the Himalayas and bordered to the south, east and west by the Republic of India and to the north by the People's Republic of China. Bhutan is separated from the nearby country of Nepal to the west by the Indian state of Sikkim, and from Bangladesh to the south by the Indian states of Assam and West Bengal.

Bhutan existed as a patchwork of minor warring fiefdoms until the early 17th century, when the area was unified by Shabdrung Ngawang Namgyal, who fled religious persecution in Tibet and cultivated a separate Bhutanese identity. In the early 20th century, Bhutan came into contact with the British Empire, after which Bhutan continued strong bilateral relations with India upon its independence. In 2006, Business Week rated Bhutan the happiest country in Asia and the eighth-happiest in the world, based on a global survey.