| Korean War | 1,200,000 | 1950–1953 | Korea | [30] |
| Vietnam War/Second Indochina War | 800,000–3,800,000 | 1955–1975 | Vietnam | [40][41][42] |
| Biafra War | 1,000,000 | 1967–1970 | Nigeria | |
| Soviet war in Afghanistan | 957,865–1,622,865 | 1979–1989 | Afghanistan | [34][35][36] |
| Iran–Iraq War/First Persian Gulf War | 1,000,000 | 1980–1988 | Middle East | [32] |
| Second Congo War/Great War of Africa | 2,500,000–5,400,000 | 1998–2003 | Central Africa | [23][24][25][26] |
I don’t know if the mass killings by the Khmer Rouge are included under “Second Indochina War”—I would think not since they continued beyond 1975. Mao alone killed more people than died in any of the conflicts listed. The list omits the death toll from the partition of India in 1947.
Cultural Revolution ~30,000,000.