Captain-Commandant is a subaltern commissioned officer rank in the Air component

Belgian Air Force

The Air Component, formerly the Belgian Air Force, is the air arm of the Belgian Armed Forces. Originally founded in 1909, it is one of the world's first air forces, and was a pioneer in aerial combat during the First World War...

, Land component

Belgian Army

The Land Component is organised using the concept of capacities, whereby units are gathered together according to their function and material. Within this framework, there are five capacities: the command capacity, the combat capacity, the support capacity, the services capacity and the training...

, the old Belgian Gendarmerie

Belgian Gendarmerie

The Gendarmerie was the former paramilitary police force of Belgium. The Gendarmerie became a civilian police organisation in 1992, a status retained until January 1, 2001, when it was, together with the other existing police forces in Belgium, abolished and replaced by the Local Police and...

 and Medical component of the Belgian Armed Forces

Military of Belgium

The Belgian Army is the national military of Belgium. The Belgian Army was established after Belgium became independent in October 1830...

. A Kapitein-Commandant (Dutch) or Capitaine-Commandant (French) ranks directly above a Captain and immediately under a Major

Major

Major is a rank of commissioned officer, with corresponding ranks existing in almost every military in the world.When used unhyphenated, in conjunction with no other indicator of rank, the term refers to the rank just senior to that of an Army captain and just below the rank of lieutenant colonel. ...

. Officers of this rank usually serve in staff functions or more rarely as small unit commanders (squadron, company

Company (military unit)

A company is a military unit, typically consisting of 80–225 soldiers and usually commanded by a Captain, Major or Commandant. Most companies are formed of three to five platoons although the exact number may vary by country, unit type, and structure...

). The insignia are three pips under a narrow stripe for the Land component, three blue stripes with navy curl for the Air component and three gold stripes with navy curl for the Medical component.
In the Navy component, the rank is called Ship-of-the-Line Lieutenant first class

Ship-of-the-Line Lieutenant

Ship-of-the-line lieutenant is a common naval rank, equivalent to the naval rank of Lieutenant in the UK, Commonwealth and US.The name of the rank derives from the name of the largest class of warship, the ship of the line, as opposed to smaller types of warship .The rank is lieutenant de vaisseau...

 (Luitenant ter zee eerste klasse or Lieutenant de vaisseau de première classe), and insignia are two and a half gold stripes with navy curl.

See in comparison: Senior Captain

Senior Captain

Senior Captain is a rare military rank which is used in some countries armed forces.-Army:In some armies of the world, the senior captain is a rank between a regular Captain and a Major. The rank is often only found in armies and air forces...

, Stabshauptmann

Stabshauptmann

Stabshauptmann meaning "Staff Captain", is the highest military rank in the Bundeswehr for specialist officers . Instead of being promoted to the rank of major, specialist officers are promoted to the rank of Stabshauptmann and given the salary of a Major...

.