GSA

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Commerce

Citroën GSA, a French automobile
GameSpy Arcade, a utility for use with network computer games
General sales agent, an airline sales representative
Global mobile Suppliers Association, a not-for-profit industry organisation representing companies across the worldwide mobile ecosystem
Google Search Appliance, a device for document indexing
Global Semiconductor Alliance, a semiconductor industry trade group
Global Sourcing Association, a trade association in the United Kingdom
Gordon Stanfield Animation, a Canadian animation studio

Gay–straight alliance, a North American student organization
German Studies Association, an organization of scholars of Germany, Austria, and Switzerland
Girls' Schools Association, in the United Kingdom
Graduate student assistant
Graduate student association
Green Schools Alliance, in the United States

European GNSS Agency, an EU agency concerned with navigation satellites
General Services Administration, a United States federal agency that supports other US agencies
Ghana Standards Authority
Global Arrangement on Sustainable Steel and Aluminum, a proposed trade agreement between the United States and European Union
Groupement Spécial Autonome, now the Army Special Forces Brigade, French Army special forces command