173rd
- 173
- 173 (number)
- 173 BC
- 173D Special Troops Battalion
- 173d Air Refueling Squadron
- 173rd (3/1st London) Brigade
- 173rd Airborne Brigade Combat Team
- 173rd Battalion (Canadian Highlanders), CEF
- 173rd Division (People's Republic of China)
- 173rd Fighter Wing
- 173rd New York State Legislature
- 173rd New York Volunteer Infantry
- 173rd Ohio Infantry
- 173rd Rifle Division
- 173rd Special Operations Aviation Squadron
- 173rd Support Battalion (United States)
- 173rd Tunnelling Company
- 173rd meridian east
- 173rd meridian west
- 173rd pope
- Pennsylvania's 173rd Representative District