The World Service Authority (WSA), founded in 1954, is a non-profit organization that educates about and promotes "world citizenship", "world law", and World Government. It is best known for issuing World Passports. It has an office in Washington, D.C. The office in Shanghai, People's Republic of China, closed as of 1 January 2010. It is currently headed by David M. Gallup, an attorney.
The WSA was founded by Garry Davis, a former Broadway actor and World War II bomber pilot, who renounced his U.S. citizenship in 1948 to live as a "citizen of the world". It was set up to be the administrative agency of the "World Government of World Citizens" which he declared on 4 September 1953. Besides issuing World Passports, the WSA registers applicants as "world citizens" and issues "world citizen" identity documents, such as birth certificates, identity cards, and marriage certificates. Among cases of individuals who were helped by the World Marriage Certificate, one example includes couples in Israel unable to have a religious marriage, according to Garry Davis. The WSA has also issued World Government Postal Stamps  which, according to Garry Davis, helped to convey thousands of letters between China and Taiwan in the early 1980s.
The WSA has a legal department which helps WSA document holders in attaining their rights from national authorities. This is done, inter alia, by writing letters on behalf of WSA document holders to heads of state and national officials; and by working with attorneys of WSA document holders.