Commandant-general is a military rank in several countries and is generally equivalent to that of commandant.
Commandant general is the highest rank in the Argentine National Gendarmerie, and is held by the national director of the gendarmerie and his senior deputies. Depending on the appointment, it may be equal to any Argentine army rank from brigade general to the highest Argentine army rank, lieutenant general.
During the Irish Civil War of 1922-23, the Irregulars, or anti-Treaty IRA, applied this term to the leaders of their various brigades throughout the country. The term was acquired from the Boer rank, through veterans of the Irish Transvaal Brigade.
Comandante generale (commandant general), in Fascist Italy's MVSN, was the title of the head of the Blackshirts, held by Benito Mussolini from 1922 to 1943. Nowadays, is the title held by the commander of the Carabinieri.
Portugal and Brazil
Presently, in Portugal is the title of the general officer commanding the National Republican Guard (GNR). In the past, it was also the title of the commanding officers of the Public Security Police, the former Fiscal Guard and the former Portuguese Legion.
In Brazil, it is the title of the commanding officers of the state military polices and military fire departments.
Commandant-general was a military rank in South African Republic and the Orange Free State Republic as well as in the Union of South Africa and the Republic of South Africa. The commandant-general of one of the Boer republics was the head of its armed forces. The rank of full general in the South African Army was renamed "commandant-general" in 1956 and was in use until 1967 when it reverted simply to "general"
Commandant-general was, at times, also a post designation, rather than a rank. Brigadier-General CF Beyers was the first Commandant-General of the Active Citizen Force  until he resigned in 1914. He was succeeded as Commandant-General by Major-General J C Smuts with effect from 16 September 1914.
In the United Kingdom, commandant-general is a military appointment, not a rank. See the following for more details:
- Radburn, A (1990). "South African Army Ranks and Insignia". Militaria. 2 20.
- Jooste, L (1996). "DIE POLITIEKE KOERSWENDING VAN 1948 BESORG 'N NUWE IDENTITEIT AAN DIE UNIEVERDEDIGINGSMAG". Militaria. 2 26. Retrieved 14 Sep 2012.
- National Archives, Pretoria: GG Box 683, File No. 9/104/1