Allan Gilmour Sr. (October 1775 – 4 March 1849) was a Scottish-born lumber merchant and shipowner.
He attended the Mearns parish school in the 1780s and early 1790s, and by 1795 ran a small timber business there.
Suffering from the Napoleonic blockade of Baltic timber, he quickly established a new, North American base for the company, sending his brother James Gilmour, and Alexander Rankin to the Miramichi River (New Brunswick, Canada) in 1812.
Pollok, Gilmour and Company was soon the largest operator in the British North American timber market, with further branches established at Saint John (1822), Quebec (1828), Montreal (1829), Bathurst, N.B.
To resolve the dispute, effective leadership was transferred to Robert Rankin, the manager of the Saint John operation.