The Union Minière du Haut-Katanga (French; literally "Mining Union of Upper-Katanga") was a Belgian mining company (with minority British share) which controlled and operated the mining industry in the copperbelt region in the modern-day Democratic Republic of the Congo between 1906 and 1966.

Created in 1906, the UMHK was founded as a joint venture of the Belgian Compagnie du Katanga, the Belgian Comité Spécial du Katanga and the British Tanganyika Concessions. The Compagnie du Katanga was a subsidiary of the Compagnie du Congo pour le Commerce et l'Industrie (CCCI), which was controlled by the country's largest conglomerate, the Société Générale de Belgique. With the support of the colonial state, the company was allocated a 7,700 square miles (20,000 km²) concession in Katanga.

Its primary product was copper, but it also produced tin, cobalt, radium, uranium, zinc, cadmium, germanium, manganese, silver, and gold. UMHK was part of a powerful group of global copper producers. By the start of World War II, the Société Générale controlled 70% of the Congolese economy. Exercising preponderant influence over the Comité spécial, the Société Générale effectively controlled the Union Minière from its inception to 1960. In 1967, the Union Minière du Haut-Katanga reorganized as Union Minière, and in 2001 it became Umicore.