3rd Congress may refer to:

• 3rd Congress of the Philippines (1954–1957)
• 3rd Congress of the Russian Social Democratic Labour Party (1905)
• 3rd Congress of the Workers' Party of Korea (1956)
• 3rd National Congress of the Chinese Communist Party (1923)
• 3rd National Congress of the Kuomintang (1929)
• 3rd National Congress of the Lao People's Revolutionary Party (1982)
• 3rd National People's Congress (1964–1975)
• 3rd United States Congress (1793–1795)
• 3rd World Congress of the Comintern (1921)
• Brussels Congress (1868), the 3rd Congress of the First International
• International Socialist Workers Congress, Zürich 1893, the 3rd Congress of the Second International

This disambiguation page lists articles associated with the title 3rd Congress.
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