Barkley is a Kansas City, Missouri, United States, based full-service advertising agency known for their work on Sonic Drive-In Restaurants, Planet Fitness, and Dairy Queen. Founded in 1964, they employ 400+ people; 2008 capitalized billings were $485 million. Barkley is the largest independent advertising agency in Kansas City, and the seventh-largest independent advertising agency in the U.S.
In March 2008, Barkley acquired Ripple Effects Interactive. The new venture was re-branded BarkleyREI.