TBWA Worldwide is an international advertising agency whose main headquarters are in Midtown Manhattan, New York City, United States. The agency is a unit of Omnicom Group, the world's third largest advertising agency holding company. It was founded in 1970 in Paris, France, by William G. Tragos, Claude Bonnange, Uli Wiesendanger, and Paolo Ajroldi. The first letter of each founder's name provided the initials for the new organization. They were purchased by the Omnicom Group in 1993.