The Free Republic of the Congo, often referred to as Congo-Stanleyville, was a short-lived rival government to the Republic of the Congo (Congo-Léopoldville) based in the eastern Congo and led by Antoine Gizenga.

The Republic of the Congo was a sovereign state in Central Africa, created with the independence of the Belgian Congo in 1960. From 1960 to 1966, the country was also known as Congo-Léopoldville to distinguish it from its northwestern neighbor, which is also called the Republic of the Congo, alternatively known as "Congo-Brazzaville". In 1964, the state's official name was changed to the Democratic Republic of the Congo, but the two countries continued to be distinguished by their capitals; with the renaming of Léopoldville as Kinshasa in 1966, it became also known as Congo-Kinshasa. After Joseph Désiré Mobutu, commander-in-chief of the national army, seized control of the government in 1965, the Democratic Republic of the Congo became the Republic of Zaire in 1971. It would again become the Democratic Republic of the Congo in 1997. The period between 1960 and 1964 is referred to as the First Congolese Republic.