98th is the ordinal form of the number 98. 98th or Ninety-eighth may also refer to:
A fraction, , equal to one of 98 equal parts
Geography 98th meridian east, a line of longitude 98th meridian west, a line of longitude 98th Street (Manhattan)
Military 98th Brigade (disambiguation) 98th Division (disambiguation) 98th Regiment (disambiguation) 98th Squadron (disambiguation)
Other 98th century 98th century BC
See also April 8, 98th day of the year in a standard year 98 (disambiguation)