27th is the ordinal form of the number 27. 27th or Twenty-seventh may also refer to:
A fraction, , equal to one of 27 equal parts 27th of the month, a recurring calendar date
Geography 27th meridian east, a line of longitude 27th meridian west, a line of longitude 27th parallel north, a circle of latitude 27th parallel south, a circle of latitude 27th Avenue 27th Street (disambiguation)
Military 27th Army (disambiguation) 27th Battalion (disambiguation) 27th Brigade (disambiguation) 27th Division (disambiguation) 27th Regiment (disambiguation) 27th Squadron (disambiguation)
Other Twenty-seventh Amendment (disambiguation) Twenty-seventh Amendment to the United States Constitution 27th century 27th century BC
See also 27 (disambiguation) The 27th Day, 1957 American black-and-white science fiction film The Twenty-Seventh City, 1988 American satirical thriller novel