54th is the ordinal form of the number 54. 54th or Fifty-fourth may also refer to:
A fraction, , equal to one of 54 equal parts
Geography 54th meridian east, a line of longitude 54th meridian west, a line of longitude 54th parallel north, a circle of latitude 54th parallel south, a circle of latitude 54th Street (disambiguation)
Military 54th Army (disambiguation) 54th Brigade (disambiguation) 54th Division (disambiguation) 54th Regiment (disambiguation) 54th Squadron (disambiguation)
Other 54th century 54th century BC
See also 54 (disambiguation)