Sylvia A Lewis (born 23 December 1941) is a British former swimmer. She competed at the 1960 Summer Olympics and the 1964 Summer Olympics. She also represented England in the 110 yards backstroke at the 1958 British Empire and Commonwealth Games in Cardiff, Wales. Four years later she won a silver medal in the 220 yards backstroke and a bronze medal in the 110 yards backstroke at the 1962 British Empire and Commonwealth Games in Perth, Western Australia.