83rd is the ordinal form of the number 83. 83rd or Eighty-third may also refer to:
A fraction, , equal to one of 83 equal parts
Geography 83rd meridian east, a line of longitude 83° east of Greenwich 83rd meridian west, a line of longitude 83° west of Greenwich 83rd parallel north, a circle of latitude that is 83° north of the Earth's equatorial plane, in the Arctic 83rd parallel south, a circle of latitude that is 83° south of the Earth's equatorial plane, in the Antarctic 83rd Street (disambiguation)
Government 83rd Delaware General Assembly, a meeting of the Delaware Senate and the Delaware House of Representatives 83rd United States Congress, a meeting of the United States Senate and the United States House of Representatives List of United States senators in the 83rd Congress Lindner ethics complaint of the 83rd Minnesota Legislative Session
Military 83rd Group Army, People's Republic of China 83rd Brigade (disambiguation), several units 83rd Division (disambiguation), several units 83rd Regiment (disambiguation), several units 83rd Squadron (disambiguation), several units
Other 83rd century 83rd century BC 83rd Academy Awards, a ceremony that honored the best films of 2010 in the United States and took place on February 27, 2011 83rd Grey Cup, the 1995 Canadian Football League championship game
See also 83 (disambiguation) AD 83, the year 83 (LXXXIII) of the Julian calendar