William Weber Buechner (1914–85) was an internationally recognized experimental nuclear physicist and past chairman of the physics department at the Massachusetts Institute of Technology (MIT.)
Born in Vallejo, California, Buechner received his BSc in 1935 and his PhD in 1939, both from MIT. He worked with the American physicist Robert J. Van de Graaf on the development of the Van de Graaf generator and pioneered precision nuclear-energy-level measurements.
After three years as a research associate at MIT, he joined its faculty and rose through the ranks and served as chair of the physics department 1961–67. He retired from MIT as a professor in 1978. He wrote extensively for professional journals, and was, for several years, a member of the editorial board of Physics Today.