Campbell Ewald is an advertising and marketing communications agency headquartered in Detroit, Michigan, with offices in Los Angeles and New York.

[5][6] Chevrolet became the agency's first major client in 1919 and by 1922, Campbell Ewald was awarded all of General Motors' ad business.

In 1928, Henry Ewald bought a Chevrolet dealership at Mack and Gratiot in Detroit to better understand the automotive industry.

[11] In April 2010, GM moved Chevrolet's advertising business to rival agency Publicis Worldwide, ending a 91-year relationship with Campbell Ewald.

Controversy arose when several environmentalist groups began creating anti-Chevrolet ads that garnered national media attention.

[23] In 2021, the company released a two-minute film directed by and starring Spike Lee, promoting digital currency machine operator Coin Cloud.