Republic of the Congo may refer to:
- Republic of the Congo, the country also known as Congo-Brazzaville (1960–present)
- People's Republic of the Congo, a socialist state in the Republic of the Congo (1969–1992)
- Democratic Republic of the Congo, the country also known as Congo-Kinshasa (1997–present), formerly known as Zaire.
- Republic of the Congo (Léopoldville), an antecedent of the present Democratic Republic of the Congo, also known as Congo-Léopoldville (1960–1971)
- Free Republic of the Congo, a rival government of Congo-Léopoldville, also known as Congo-Stanleyville (1960–1962)
- People's Republic of the Congo, a rival government of Congo-Léopoldville declared by the Simba rebellion (1963–1965)