1. Germany:
- Hermann Müller, Minister of Foreign Affairs
- Johannes Bell, Minister of the Treasury
2. France:
- Georges Clemenceau, Prime Minister
- André Tardieu, Minister of Foreign Affairs
3. United Kingdom:
- David Lloyd George, Prime Minister
- Arthur Balfour, Foreign Secretary
4. United States:
- Woodrow Wilson, President
- Robert Lansing, Secretary of State
5. Italy:
- Vittorio Emanuele Orlando, Prime Minister
- Sidney Sonnino, Minister of Foreign Affairs
6. Japan:
- Saionji Kinmochi, Prime Minister
- Shidehara Kijuro, Japanese Ambassador to France
7. Belgium:
- Henri Jaspar, Minister of Foreign Affairs
- Paul Hymans, Minister of Justice
8. Czechoslovakia:
- Karel Kramář, Prime Minister
- Edvard Beneš, Minister of Foreign Affairs
9. Poland:
- Roman Dmowski, Chairman of the Polish National Committee
- Ignacy Paderewski, Prime Minister
10. Romania:
- Ion I. C. Brătianu, Prime Minister
- Nicolae Titulescu, Minister of Foreign Affairs
11. Yugoslavia:
- Nikola Pašić, Prime Minister
- Ivan Žolger, Minister of Justice
In addition to these signatories, representatives of other countries and organizations were also present at the signing ceremony, including representatives from Canada, Australia, New Zealand, South Africa, India, and China.