Allan David Franklin (born 1 August 1938, Brooklyn) is an American physicist, historian of science, and philosopher of science. Franklin received in 1959 his bachelor's degree from Columbia University and in 1965 his PhD in physics from Cornell University. He was from 1965 to 1966 a postdoc and from 1966 to 1967 an instructor at Princeton University. At the University of Colorado Boulder he became in 1982 a full professor in physics, after having been there from 1967 to 1973 an assistant professor and from 1973 to 1982 an associate professor.