Mengistu Haile Mariam is an Ethiopian former politician and former army officer who was the head of state of Ethiopia from 1977 to 1991 and General Secretary of the Workers' Party of Ethiopia from 1984 to 1991. He was the chairman of the Derg, the socialist military junta that governed Ethiopia, from 1977 to 1987, and the president of the People's Democratic Republic of Ethiopia (PDRE) from 1987 to 1991.

The Workers' Party of Ethiopia was a Marxist–Leninist communist party in Ethiopia from 1984 to 1991 led by General Secretary Mengistu Haile Mariam. The Workers' Party of Ethiopia was founded in 1984 by the Derg, the ruling provisional government of Ethiopia, as the vanguard party for a planned future socialist state. In 1987, the WPE became the ruling party after the establishment of the People's Democratic Republic of Ethiopia, and the only legal political party until it was disbanded in 1991. A party was attempted to be formed with the same name in August 2022, but the application was rejected.