Francis Preston Blair Lee III (May 19, 1916 – October 25, 1985) was an American Democratic politician. He served as the Secretary of State of Maryland from 1969 to 1971. He was Lieutenant Governor of Maryland from 1971 to 1979 and served as the Acting Governor of Maryland from 1977 to 1979, during Marvin Mandel's self-imposed suspension of gubernatorial powers and duties.