Alexander Sproat (June 19, 1834 – August 20, 1890) was an Ontario land surveyor, businessman and political figure.
He was born near Milton in Halton County, Upper Canada, in 1834, son of Adam Sproat and Eleanor Brown.
In 1866, the volunteer companies of the County Bruce were formed into the 32nd Battalion of Infantry and Alex was made lieutenant colonel in command.
When the North-West Rebellion broke out in 1885 the Prince Albert Volunteers, who were sent to Duck Lake, were sworn in by Colonel Sproat, his son Adam (Bruce) among them.
His brother-in-law Alexander McNabb was wounded in the battle and his friend John Morton was killed.