John G. Davies (1929–2020) was an Australian-American swimmer and US federal judge.
John G. Davies may also refer to: John George Davies (1846–1913), Tasmanian politician, newspaper proprietor, and cricketer John Gerwyn Davies (born 1959), Welsh footballer John Goldup Davies (1914–1989), English swimmer John Gordon Davies (1919–1990), British theologian John Gwynoro Davies (1855–1935), Welsh Methodist minister
See also John Davies (disambiguation)