43rd Brigade
- 43rd (Howitzer) Brigade Royal Field Artillery
- 43rd Battalion (disambiguation)
- 43rd Division (disambiguation)
- 43rd Group (disambiguation)
- 43rd Heavy Artillery Brigade (Ukraine)
- 43rd Independent Gurkha Infantry Brigade
- 43rd Indian Brigade
- 43rd Infantry Brigade (United Kingdom)
- 43rd Mechanized Brigade (Netherlands)
- 43rd Mechanized Brigade (Ukraine)
- 43rd Military Police Brigade (United States)
- 43rd Regiment (disambiguation)
- 43rd Squadron (disambiguation)
- 43rd Sustainment Brigade (United States)