The Royal Belgian Sea Cadet Corps (Dutch:Koninklijk Marine Kadettenkorps, French:Corps Royal des Cadets de Marine) is a Belgian non-profit youth organisation whose purpose is to stimulate teamwork and discipline in individuals from the age of 12, while teaching other important skills and values such as first aid, navigation and linguistic skills, operating a vessel, military drill and much more.

A few times a year, longer cruises are organised either within Belgium or neighbouring countries, such as the United Kingdom and the Netherlands.

A remarkable number of the cadre are or have had a job in the military, law enforcement, maritime sector and medical or technical fields.

Despite this fact, the Belgian Defense Ministry frequently allows the Cadet Corps to use its bases, vehicles and equipment.

During some national camps of the Cadet Corps, the Defense Ministry helps in organizing activities that are more military-oriented such as letting the cadets join in patrolling the Belgian coast with a patrol vessel of the Belgian Navy, physical training and obstacle courses, and ceremonial events such as the annual national military parade in Brussels on July 21.

The maritime schools in Antwerp and Ostend continued with training cadets, even after the disbandment of the Torpedists and Seafarers Corps in 1927.

In 1969 the Belgian Navy signed a convention, officially recognising and supporting the Sea Cadet Corps.

They will then complete a written exam per rank and will march a route, where they will get inspected at random locations, until they reach the base again.

A member can stay in the group of cadets until the age of 21, where they then are required to leave, become a Civilian Volunteer or become a Petty Officer.

In order to rank up in the group of cadets, one must usually pass a written exam and a practical test, have shown to be of good moral character (meaning that they have not violated the rules and regulations).

Ranks below "Cadet" are mostly taught practical and theoretical knowledge and are in normal circumstances never put in a leading role.

Cadet First Classes, and especially Quartermasters, will often be appointed as a squad leader during national camps and is given more leadership requiring tasks as they are members of 16 years or older and are expected to be more responsible.