84th is the ordinal form of the number 84. 84th or Eighty-fourth may also refer to:
A fraction, , equal to one of 84 equal parts
Geography 84th meridian east, a line of longitude 84th meridian west, a line of longitude 84th parallel north, a circle of latitude 84th parallel south, a circle of latitude 84th Street (disambiguation)
Military 84th Brigade (disambiguation) 84th Division (disambiguation) 84th Regiment (disambiguation) 84th Squadron (disambiguation)
Other 84th century 84th century BC
See also 84 (disambiguation)