80th is the ordinal form of the number 80. 80th or Eightieth may also refer to:
A fraction, , equal to one of 80 equal parts
Geography 80th meridian east, a line of longitude 80th meridian west, a line of longitude 80th parallel north, a circle of latitude 80th parallel south, a circle of latitude 80th Street (disambiguation)
Military 80th Group Army, People's Republic of China 80th Brigade (disambiguation) 80th Division (disambiguation) 80th Regiment (disambiguation) 80th Squadron (disambiguation)
Other 80th century 80th century BC
See also 80 (disambiguation)