49th is the ordinal form of the number 49. 49th or Forty-ninth may also refer to:
A fraction, , equal to one of 49 equal parts
Geography 49th meridian east, a line of longitude 49th meridian west, a line of longitude 49th parallel north, a circle of latitude 49th parallel south, a circle of latitude 49th Street (disambiguation)
Military 49th Army 49th Brigade (disambiguation) 49th Division (disambiguation) 49th Regiment (disambiguation) 49th Squadron (disambiguation)
Other 49th century 49th century BC
See also 49 (disambiguation)