John G. Davies (disambiguation)

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