42nd is the ordinal form of the number 42.42nd or Forty-second may also refer to:
A fraction, , equal to one of 42 equal parts
Geography 42nd meridian east, a line of longitude 42nd meridian west, a line of longitude 42nd parallel north, a circle of latitude 42nd parallel south, a circle of latitude 42nd Street (disambiguation)
Military 42nd Battalion (disambiguation) 42nd Brigade (disambiguation) 42nd Division (disambiguation) 42nd Regiment (disambiguation) 42nd Squadron (disambiguation)
Other 42nd Amendment 42nd century 42nd century BC
See also 42 (disambiguation)