Colonel William Smith Gill CB VD DL (16 February 1865 – 25 December 1957) was a Scottish Volunteer Force officer and paint manufacturer. Born at Old Machar, Peterculter, Aberdeenshire, Gill was the son of Alexander Ogston Gill (1832–1908) and Barbara Smith Marr. By 1896, Gill was a partner with his father in Farquhar & Gill, paint manufacturers. On 30 June 1898, at Queen's Cross Church, Aberdeen, Gill married Ruth Littlejohn, a daughter of David Littlejohn, DL, and they had five children: In 1925, Gill was appointed as a Deputy lieutenant of Aberdeen.