This article is about the American architect and structural engineer. For other uses, see John Merrill (disambiguation).

John Ogden Merrill Sr. (1896 – 13 June 1975) was an American architect and structural engineer. He was chiefly responsible for the design and construction of the United States Air Force Academy campus and for the development of Oak Ridge, Tennessee where the atomic bomb was developed. He was a founding partner of the international architectural firm of Skidmore, Owings & Merrill.