53rd is the ordinal form of the number 53. 53rd or Fifty-third may also refer to:
A fraction, , equal to one of 53 equal parts
Geography 53rd meridian east, a line of longitude 53rd meridian west, a line of longitude 53rd parallel north, a circle of latitude 53rd parallel south, a circle of latitude 53rd Street (disambiguation)
Military 53rd Army 53rd Brigade (disambiguation) 53rd Division (disambiguation) 53rd Regiment (disambiguation) 53rd Squadron (disambiguation)
Other 53rd century 53rd century BC
See also 53 (disambiguation)