George Sleeman (August 1, 1841 – December 16, 1926) was a brewer, a major figure in Canadian baseball, and a politician in Ontario, Canada. He was mayor of Guelph from 1880 to 1882 and from 1905 to 1906. Sleeman was also the president of the Guelph Rifle Association for 20 years, president of the Guelph Turf Club, president of the Guelph Bicycle Club, and, for four years, president of the Ontario Brewing and Malting Association. He helped establish the Royal City Curling Club. His brewery also sponsored an amateur baseball team called the Silver Creek Club.
The son of John H. Sleeman, an immigrant from England, and Ann M. Burrows, he was born in St. David's (Niagara-on-the-Lake), Upper Canada and was educated there and in Guelph. The family moved to Guelph in 1857 and in 1859, he became general manager of his father's Silver Creek Brewery; six years later he became a partner. Sleeman fully took over the operation in 1867 when his father retired. In 1900, he incorporated his breweries as the Sleeman Brewing and Malting Company. The family played an important role in the establishment of Beer in Canada.
In 1863, Sleeman married Sarah Hill. The family lived in Guelph, later in a gothic custom-built mansion that was completed in 1891 at an estimated $30,000, near what is now called Silver Creek Parkway. In 1876, he was elected to Guelph town council for the first time. In 1877 he was elected Deputy Reeve and in 1880, after Guelph was transformed from a town into a city, he became the first mayor. He was elected mayor three subsequent times.
By 1890, his Silver Creek Brewery had 15 retail stores in two provinces (Ontario and Quebec). In 1894, Sleeman set up the Guelph Street Railway Company, an electric streetcar company. He invested so much of his own money in the operation that by 1902 the banks took over his house, railway and his brewery. (Sleeman's original railway was the foundation of the subsequent Radial Railway Company that expanded to serve more distant communities.) Sleeman set up a rival brewery in 1903, Springbank, and the banks sold him back the original brewery a year later.
Sleeman retired from the family business in 1905 and died in Guelph in 1926 at the age of 85 after undergoing an operation for an obstructed bowel.
After being taken over by the Jockey Club Brewery in 1933, the Sleeman brand was discontinued and the brewery ceased production six years later. In 1985, George Sleeman's great-grandson John Warren Sleeman reincorporated the Sleeman Breweries and began producing beers, and Sleeman’s Cream Ale, using the original recipes provided to him by an aunt.