4th Corps () or Cửu Long Corps (, literally: "Corps of Cửu Long" or "Corps of the Mekong") is one of the four regular army corps of the People's Army of Vietnam. First organized in 1974 during the Vietnam War, 4th Corps had a major role in the Ho Chi Minh Campaign and the Cambodian–Vietnamese War. Today the corps is stationed in Dĩ An, Bình Dương.