William Fleming Turnbull (26 January 1879 — 26 December 1959) was a Scottish first-class cricketer.
Turnbull was born at Falkirk in January 1879.
A club cricketer for Stewart's Former Pupils, Turnbull made his debut in first-class cricket for Scotland against Ireland at Glasgow in 1911.
He made three further first-class appearances for Scotland, playing against the touring Indians in 1911 at Galashiels, and twice against the touring South Africans in 1912 at Glasgow and Edinburgh.
In July 1935, he was fined 10 shillings for driving a motor vehicle without a license.