The Congress of Deputies (Spanish Congreso de los Diputados) is the lower house of Spain.

Congress of Deputies may also refer to the following legislatures :

• the Congress of Deputies a.k.a. Republican cortes [es] (1931–1939), unicameral legislature of the Second Spanish Republic
• the Congress of People's Deputies of the Soviet Union (Съезд народных депутатов, Sʺezd narodnykh deputatov, 1989–1991)
• the Congress of People's Deputies of Russia (Съезд народных депутатов, Sʺezd narodnykh deputatov, 1990–1993)
• the Legislative Assembly of Costa Rica, a.k.a. Congress of Deputies
• the Congress of the Republic of Guatemala (Congreso de la República), made up of 160 Deputies (Diputados)
• the National Congress of Honduras (Congreso Nacional), made up of 128 Deputies (Diputados)