23rd is the ordinal form of the number 23. 23rd or Twenty-third may also refer to:
A fraction, , equal to one of 23 equal parts 23rd of the month, a recurring calendar date
Geography 23rd meridian east, a line of longitude 23rd meridian west, a line of longitude 23rd parallel north, a circle of latitude 23rd parallel south, a circle of latitude 23rd Avenue 23rd Street (disambiguation)
Military 23rd Army (disambiguation) 23rd Battalion (disambiguation) 23rd Brigade (disambiguation) 23rd Division (disambiguation) 23rd Regiment (disambiguation) 23rd Squadron (disambiguation)
Other Twenty-third Amendment (disambiguation) 23rd century 23rd century BC "The 23rd", title of a season 1 episode of New Girl
See also 23 (disambiguation) The Twenty-Third Man, 1957 British mystery detective novel