Ralph Alanson Sawyer (January 5, 1895 – December 6, 1978) was an American physicist and a leader in American science. A New Hampshire native, he graduated from the Atkinson Academy in 1911 and in 1915 from Dartmouth. He then went to the University of Chicago where, under the direction of R. A. Millikan, he finished his PhD in 1919, a time during which he also served as a scientific liaison officer in the United States Navy. At the invitation of Harrison M. Randall, Sawyer then joined the faculty of the Physics Department at the University of Michigan, an affiliation that he retained for his entire career.