The Burger wars are a series of off-and-on comparative advertising campaigns consisting of mutually-targeted advertisements that highlight the intense competition between hamburger fast food chains McDonald's, Wendy's, Burger King and others in the United States. The term first came into use during the late 1970s due to an attempt by Burger King to generate increased market and mind-share by attacking the size of bigger rival McDonald's hamburgers.

Burger King Corporation is an American multinational chain of hamburger fast food restaurants. Headquartered in Miami-Dade County, Florida, the company was founded in 1953 as Insta-Burger King, a Jacksonville, Florida–based restaurant chain. After Insta-Burger King ran into financial difficulties, its two Miami-based franchisees David Edgerton (1927–2018) and James McLamore (1926–1996) purchased the company in 1959 and renamed it "Burger King". Over the next half-century, the company changed hands four times and its third set of owners, a partnership between TPG Capital, Bain Capital, and Goldman Sachs Capital Partners, took it public in 2002. In late 2010, 3G Capital of Brazil acquired a majority stake in the company in a deal valued at US$3.26 billion. The new owners promptly initiated a restructuring of the company to reverse its fortunes. 3G, along with its partner Berkshire Hathaway, eventually merged the company with the Canadian-based doughnut chain Tim Hortons under the auspices of a new Canadian-based parent company named Restaurant Brands International.