Allied Contribution to Vietnam
Thirty-nine nations provided support to South Vietnam in one form or another, answering the call of the Free World Assistance Program launched by United States President Lyndon B. Johnson.
Only those below provided military forces, and only Australia and New Zealand apart from the USA covered their own expenses.
| Country | Participation at Height of Involvement | Losses |
| Australia | 8,300 troops and advisors at a time, troops rotating. 46,852 Austrlian troops served in Vietnam 1962-1973. | Approximately 500 dead |
| Canada | No government involvement but thousands of Canadians (estimated numbers vary greatly from anywhere between 3,500 to 30,000) served with the US armed forces in Vietnam, including at least one Medal of Honour awardee. | At least 103 |
| Italy | Ten man surgical team and civilian aid including scholarships. | |
| Japan | Substantial monetary aid chiefly through repatriations, medical goods, and the construction of a neurological ward in Saigon. | |
| New Zealand | 534 soldiers - One battalion under Australian (1st Brigade) command at any one time. | 37 KIA |
| Philippines | 12,000 troops | About 1,000 |
| South Korea | Three divisions - 48 000 soldiers | between 4,400 and 5,1000 |
| Taiwan | ? | ? |
| Thailand | over 20,000 troops including 31 Special Forces | 351 to 1,000 |
| USA | Over 540,000 troops | Approximately 50,000 |
| West germany | No troops were deployed, but a West German hospital ship S.S. Helgoland was docked at Da Nang. | 351 to 1,000 |
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