The Zionist Congress was established in 1897 by Theodor Herzl as the supreme organ of the Zionist Organization (ZO) and its legislative authority. In 1960 the names were changed to World Zionist Congress (Hebrew: הקונגרס הציוני העולמי HaKongres HaTsioni HaOlami) and World Zionist Organization (WZO), respectively. The World Zionist Organization elects the officers and decides on the policies of the WZO and the Jewish Agency, including "determining the allocation of funds." The first Zionist Congress was held in Basel, Switzerland in 1897. Any Jew over age 18 who belongs to a Zionist association is eligible to vote, and the number of elected delegates to the Congress is 500. 38% of the delegates are allocated to Israel, 29% to the United States of America, and 33% to the remainder of the countries of the Diaspora. In addition there are about 100 delegates which are appointed by International Organizations (e.g. B'nai B'rith, see below) affiliated with WZO.

After the First Zionist Congress in 1897, the Zionist Congress met every year until 1901, then every second year from 1903 to 1913 and 1921 to 1939. Until 1946, the Congress was held every two years in various European cities, save for interruptions during the two World Wars. Their goal was to build an infrastructure to further the cause of Jewish settlement in Palestine. Since the Second World War, meetings have been held approximately every four years. Also, since the creation of the State of Israel, the Congress has met every four or five years in Jerusalem.

The 38th World Zionist Congress took place in 2020.