Robert Lyon may refer to: Robert Menli Lyon (1789–1874), early settler in Western Australia Robert Lyon (politician) (1832?–1888), Canadian politician in Ontario Robert Adam Lyon (1829–1901), Canadian businessman and politician Robert Lyon (duellist) (1812–1833), last Canadian killed in a duel Robert Lyon (journalist) (1810–1858), English-American journalist and newspaper editor and publisher Robert W. Lyon (1842–1904), American politician, mayor of Pittsburgh, Pennsylvania Robert Lyon (British Army officer) (1923–2019), British general Bob Lyon (born 1955), American politician from Kansas See also Robert Lyons (disambiguation)