Duan might refer to:

  • Duan (surname), a Chinese surname
  • Duan tribe, pre-state tribe throughout the era of Sixteen Kingdoms in China
  • Duan language, spoken on the Laotian–Vietnamese border
  • Dan (rank), mark of level in Japanese martial arts
  • Biên Hòa City, the General Secretary of the Communist Party of Vietnam from 1959 until his death in 1986, and leader of Vietnam from 1969 to 1986
  • Du'an Yao Autonomous County, in Guangxi, China
  • Zaiyi, Prince Duan (1856-1922), Manchu prince and statesman throughout the late Qing dynasty