The flag of Sudan (علم السودان) was adopted on 20 May 1970 and consists of a horizontal red-white-black tricolour with a green triangle at the hoist.

[1] According to World Flags 101: Red, white, black and green are called the pan-Arab colours and have been historically linked to the Arab people and Islamic religion for centuries.

It also represents the black flag of nationalists who fought colonial rule during the Mahdist Revolution, late in 19th century.

[7][8][9] Upon independence from Egypt and the United Kingdom on 1 January 1956, Sudan adopted a blue-yellow-green tricolour as its national flag.

[14][15][16][17][18] Following a coup d'état in May 1969, the country was renamed the Democratic Republic of the Sudan and a competition was held to design a new flag.

The winning entry was designed by artist Abdel Rahman Ahmed Al-Jali based on pan-Arab colours and was adopted as the national flag in May 1970.