4th Congress

4th Congress may refer to:
 * Basel Congress (1869), the 4th Congress of the First International
 * 4th Congress of the Communist Party of Yugoslavia
 * 4th Congress of the Philippines
 * 4th Congress of the Russian Social Democratic Labour Party
 * 4th United States Congress
 * 4th National Congress of the Communist Party of China
 * 4th National Congress of the Communist Party of Vietnam
 * 4th Congress of the Lao People's Revolutionary Party
 * 4th Congress of the Communist Party of Cuba
 * 4th Congress of the Workers' Party of Korea
 * 4th World Congress of the Communist International
 * International Socialist Workers and Trade Union Congress, London 1896, the 4th Congress of the Second International