The Republic of Stellaland (Dutch: Republiek Stellaland) was, from 1882 to 1883, a Boer republic located in an area of British Bechuanaland (now in South Africa's North West Province), west of the Transvaal. After unification with the neighbouring State of Goshen, it became the United States of Stellaland (Dutch: Verenigde Staten van Stellaland) from 1883 to 1885.

During its short history, the small state became a focal point for conflict between the British Empire and the South African Republic, the two major players vying for control of the territory. After a series of claims and annexations, British fears of Boer expansionism led to its demise and, among other factors, set the stage for the Second Boer War.