Independence Day, celebrates the independence of Somaliland from United Kingdom in 1960. (Somaliland)

Independence Day in Somaliland is an annual celebration held on 18 May in Somaliland to mark the polity's declaration of independence from the Somali Democratic Republic, a unilateral proclamation which remains unrecognized the world over. Although internationally seen only as an autonomous area of Somalia, the territory's self-declared independence has endured, and the twentieth anniversary was celebrated in 2011 at the National Palace in Hargeisa, Somaliland's capital, with shops closing down for the day.

Somaliland, officially the State of Somaliland, was an independent sovereign state in the territory of the present-day unilaterally declared Republic of Somaliland, which regards itself as its legal successor. It existed on the territory of former British Somaliland for five days between 26 June 1960 and 1 July 1960, when it was merged with the formerly Italian administered Trust Territory of Somaliland to form the Somali Republic.

Somaliland, officially the Republic of Somaliland, is an unrecognised country in the Horn of Africa. It is located in the southern coast of the Gulf of Aden and bordered by Djibouti to the northwest, Ethiopia to the south and west, and Somalia to the east. Its claimed territory has an area of 176,120 square kilometres (68,000 sq mi), with approximately 6.2 million people as of 2024. The capital and largest city is Hargeisa.