6th Congress

6th Congress may refer to:
 * 6th Congress of the Philippines, 1966–1969
 * 6th Congress of the Russian Social Democratic Labour Party, held in August 1997
 * 6th United States Congress, 1799–1801
 * 6th National Congress of the Communist Party of China, held in June–July 1928
 * 6th National Congress of the Communist Party of Vietnam, held in December 1986
 * 6th Congress of the Lao People's Revolutionary Party, held in March 1996,
 * 6th Congress of the Communist Party of Cuba, held April 2011
 * 6th Congress of the Workers' Party of Korea, the last party congress held in North Korea (took place in October 1980)
 * 6th congress of the Party of Labour of Albania
 * International Socialist Congress, Amsterdam 1904, the 6th Congress of the Second International