6th Congress
- 6th Congress of the Communist Party of Cuba
- 6th Congress of the Communist Party of Yugoslavia
- 6th Congress of the Party of Labour of Albania
- 6th Congress of the Philippines
- 6th Congress of the Russian Social Democratic Labour Party (Bolsheviks)
- 6th Congress of the Workers' Party of Korea
- 6th National Congress of the Chinese Communist Party
- 6th National Congress of the Communist Party of Vietnam
- 6th National Congress of the Kuomintang
- 6th National Congress of the Kuomintang (Wang Jingwei)
- 6th National Congress of the Lao People's Revolutionary Party
- 6th National People's Congress
- 6th United States Congress
- International Socialist Congress, Amsterdam 1904