George William Allan, PC, FRGS, FZS (January 9, 1822 – July 24, 1901), was a Canadian lawyer and politician.

He toured Europe, the Nile River, Syria, the Holy Land, Turkey, and Greece giving him a lifelong appreciation of travel and winning him election to the Royal Geographical Society.

In 1858, he entered national politics representing York on the Legislative Council until Canadian Confederation.

William Allan was a pioneer who settled what was then the Township of York during John Graves Simcoe's term as governor.

William Allan eventually became the city's first postmaster and was appointed to the Legislative Council of Upper Canada.