Commander-captain

Naval officer ranks
Flag officers
Admiral of the fleet Grand admiral Admiral General admiral Vice admiral Squadron admiral Lieutenant admiral Rear admiral Admiral-superintendent Port admiral Counter admiral Divisional admiral Commodore Flotilla admiral Schout-bij-nacht
Senior officers
Captain Captain at sea Captain of sea and war Flag captain Fleet captain Post-captain Ship-of-the-line captain Commander Frigate captain Corvette captain
Junior officers
Captain lieutenant Lieutenant commander Lieutenant Ship-of-the-line lieutenant Frigate lieutenant Lieutenant junior-grade Sub-lieutenant Corvette lieutenant Ensign Midshipman

Commander-captain or commanding captain is a naval rank, used in several navies, including those of all Scandinavian nations. It is rated OF-4 within NATO forces.