Captain-commandant is a rank currently used in the Belgian Armed Forces and formerly used in the United States Revenue Cutter Service and its successor, the United States Coast Guard.

Captain-commandant (Flemish: Kapitein-commandant; French: Capitaine-commandant; German: Stabshauptmann) is a junior officer of commissioned officer rank in the air component, land component, the old Belgian Gendarmerie and medical component of the Belgian Armed Forces.

A Captain-commandant ranks directly above a captain and immediately under a major.

Officers of this rank usually serve in staff functions or more rarely as commanders of small units such as squadrons and companies.

In the naval component, the rank is called luitenant ter zee eerste klasse or Lieutenant de vaisseau de première classe ("ship-of-the-line lieutenant first class"), and the insignia is two and a half gold stripes with a naval curl.