Morgan B. Williams (September 17, 1831 – October 13, 1903) was a coal industry executive and politician who served as a Republican member of the U.S. House of Representatives for Pennsylvania's 12th congressional district from 1897 to 1899. Williams was born in Rhandir-Mwyn, Carmarthenshire, Wales. He attended the public schools and assisted his father in the operation of a lead mine. When Williams was 16, his father died, and he took control of the lead mining operation. He moved to Australia in 1856 and began gold mining. He returned to Wales in August 1861.