The 1st Commonwealth Division was the military unit that commanded Commonwealth land forces in the Korean War. The division was a part of the multinational British Commonwealth Forces Korea, with infantry units of the British Army, Canadian Army and Australian Army forming the bulk of the division. Additionally, the New Zealand Army supplied artillery contingents and an Indian medical unit was also attached. As with the "Korean Augmentation To the United States Army" (KATUSA) programme, numerous South Korean troops were seconded to the Commonwealth division to make up numbers under a scheme known as "KATCOM".

British Commonwealth Forces Korea (BCFK) was the formal name of the British Commonwealth army, naval and air units serving with the United Nations (UN) in the Korean War. BCFK included Australian, British, Canadian, Indian, and New Zealand units. Some Commonwealth units and personnel served with United States and/or other UN formations, which were not part of BCFK.