First Congress of the Communist International
| Country and Party | Delegates | Votes |
| Communist Party of Germany | Max Albert [Hugo Eberlein] | 5 |
| Russian Communist Party | V. I. Lenin, L. D. Trotsky, G,. Zinoviev, I.V Stalin, N.I. Bukharin, G.V. Chicherin. With consultative vote: V. V. Obolensky [N. Osinsky], V. V. Vorovsky | 5 |
| Communist Party of German Austria | I. Gruber [Karl Steinhardt], K. Petin | 3 |
| Communist Party of Hungary | Endre Rudnyanszky | 3 |
| Swedish Left Social Democratic Party | Otto Grimlund | 3 |
| Norwegian Social Democratic Party | Emil Stang | 3 |
| Swiss Social Democratic Party (Opposition) | Fritz Platten | 3 |
| American Socialist Labor Party | Boris Reinstein | 5 |
| Balkan Revolutionary Social Democratic Federation (Bulgarian Tesnyaki and Romanian Communist Party) | Christian Rakovsky | 3 |
| Communist Party of Poland | Jozef Unszlicht | 3 |
| Communist Party of Finland | Yrjo Sirola, Kullervo Manner, Otto Kuusinen, Jukka Rahja, Eino Rahja | 3 |
| Communist Party of the Ukraine | N. A. Skrypnik, S. I. Gopner | 3 |
| Communist Party of Latvia | Karl Gailis | 1 |
| Communist Party of Lithuania and Belorussia | Kazimir Gedris | 1 |
| Communist Party of Estonia | Hans Pogelman | 1 |
| Communist Party of Armenia | Gurgen Haikuni | 1 |
| Communist Party of the German Colonists in Russia | Gustav Klinger | 1 |
| United Group of the Eastern Peoples of Russia | Gaziz Yalymov, Hussein Bekentayev, Mahomet Altimirov, Burhan Mansurov, Kasim Kasimov | 1 |
| Zimmerwald Left of France | Henri Guilbeaux | 1 |
| Czech Communist Group | Jaroslav Handlir | |
| Bulgarian Communist Group | Stojan Dyorov | |
| Yugoslav Communist Group | lliya Milkic | |
| British Communist Group | Joseph Fineberg | |
| French Communist Group | Jacques Sadoul | |
| Dutch Social Democratic Group | S. J. Rutgers | |
| American Socialist Propaganda League | S.J. Rutgers | |
| Swiss Communist Group | Leonie Kascher | |
| Sections of the Central Bureau of Eastern Peoples: | ||
| Turkestan Gaziz | Yalymov | |
| Turkish Mustafa | Subhi | |
| Georgian Tengiz | Zhgenti | |
| Azerbaijani | Mir Djafar Baguirov | |
| Persian | Mirza Davud Bagir-Uglu Gusseinov | |
| Chinese Socialist Workers Party | Liu Shaozhou, Zhang Yongkui | |
| Korean Workers League | Kain | |
| Zimmerwald committee | Angelica Balabanoff | |