5th Congress
- 5th Congress of the Communist Party of Yugoslavia
- 5th Congress of the Philippines
- 5th Congress of the Russian Social Democratic Labour Party
- 5th Congress of the Workers' Party of Korea
- 5th National Congress of the Chinese Communist Party
- 5th National Congress of the Communist Party of Vietnam
- 5th National Congress of the Kuomintang
- 5th National Congress of the Lao People's Revolutionary Party
- 5th National People's Congress
- 5th United States Congress
- Hague Congress (1872)
- International Socialist Congress, Paris 1900