Cửu Long

Cửu Long may refer to:


 * Mekong River or Cửu Long River, a major river in Southeast Asia
 * Mekong Delta or Cửu Long Delta, region in southwestern Vietnam where the Mekong River empties into the sea
 * Cửu Long Province, a former Vietnamese province in the Mekong Delta
 * 4th Corps (Vietnam People's Army) or Cửu Long Corps, a regular army corps of the People's Army of Vietnam