39th is the ordinal form of the number 39. 39th or Thirty-ninth may also refer to:
A fraction, , equal to one of 39 equal parts
Geography 39th meridian east, a line of longitude 39th meridian west, a line of longitude 39th parallel north, a circle of latitude 39th parallel south, a circle of latitude 39th Avenue (disambiguation) 39th Street (disambiguation)
Military 39th Army (disambiguation) 39th Battalion (disambiguation) 39th Brigade (disambiguation) 39th Division (disambiguation) 39th Regiment (disambiguation) 39th Squadron (disambiguation)
Other Thirty-ninth Amendment (disambiguation) 39th century 39th century BC
See also 39 (disambiguation)