R. H. Williams may refer to:
Political figures Richard H. Williams (New York) (1807–after 1863), American state senator Richard Henry Williams (1852–1924), Canadian merchant; mayor of Regina, Saskatchewan
Writers and academics Richard Hughes Williams (1878–1919), Welsh-language writer Robert H. Williams (physicist) (born 1940), American scientist Robin Williams (physicist) (Robert Hughes Williams; born 1941), Welsh physicist and academic Rhys H. Williams (sociologist) (born 1955), American professor of sociology Rosalind H. Williams, American historian of technology
Others R. H. Williams (rugby player) (1930–1993), Welsh rugby union player Robert Hardin Williams (1909–1979), American physician, president of Endocrine Society.
See also Williams (surname)