172nd is the ordinal form of the number 172. 172nd or One hundred and seventy-second may also refer to:
A fraction, , equal to one of 172 equal parts
Geography 172nd meridian east, a line of longitude 172nd meridian west, a line of longitude
Military 172nd Brigade (disambiguation) 172nd Division (People's Republic of China) 172nd Rifle Division, Red Army 172nd Regiment (disambiguation)
See also
June 21, 172nd day of the year in a standard year