North Korea:
- Kim Il-sung: Leader of North Korea and Supreme Commander of the Korean People's Army (KPA)
South Korea:
- Syngman Rhee: President of South Korea and Supreme Commander of the Republic of Korea Armed Forces (ROK)
United States:
- Harry S. Truman (until April 1951): President of the United States and Commander-in-Chief of the United States Armed Forces
- Dwight D. Eisenhower (from April 1951): President of the United States and Commander-in-Chief of the United States Armed Forces
China:
- Mao Zedong: Chairman of the Communist Party of China and Supreme Commander of the Chinese People's Volunteer Forces (CPVF)
Soviet Union:
- Joseph Stalin: General Secretary of the Communist Party of the Soviet Union and Supreme Commander-in-Chief of the Soviet Armed Forces