Francis Weston Sears (October 1, 1898 – November 1975) was an American physicist. He was a professor of physics at MIT for 35 years before moving to Dartmouth College in 1956 and is best known for co-writing a widely-used introductory physics textbook with Mark Zemansky, often referred to as Sears and Zemansky. He was a Fellow of the Optical Society of America, and was active in the American Association of Physics Teachers, serving as its president in 1956.