4th Congress

4th Congress may refer to:
 * 4th Congress of the Communist Party of Yugoslavia (1928)
 * 4th Congress of the Philippines (1958–1961)
 * 4th Congress of the Russian Social Democratic Labour Party (1906)
 * 4th Congress of the Workers' Party of Korea (1961)
 * 4th National Congress of the Chinese Communist Party (1925)
 * 4th National Congress of the Communist Party of the Philippines (1946)
 * 4th National Congress of the Kuomintang (1931)
 * 4th National Congress of the Lao People's Revolutionary Party (1986)
 * 4th National People's Congress (1975–1978)
 * 4th United States Congress (1795–1797)
 * 4th World Congress of the Communist International (1922)
 * Basel Congress (1869), the 4th Congress of the First International
 * International Socialist Workers and Trade Union Congress, London 1896, the 4th Congress of the Second International