Abraham 'Abe' Michael Orpen (February 9, 1854 – September 22, 1937) was a Canadian businessman, best known for his ownership of several horse-racing tracks in Ontario, Canada.

Born in Toronto, Orpen first worked as a carpenter, became a hotel keeper, owned several construction-related businesses, then branched into horse-racing.

After his death, his family continued the horse-racing businesses until the 1950s, when they sold their tracks during a time of consolidation of racetracks in Ontario.

His parents both came from northern Ireland; his father Samuel Orpen was a railway paymaster from Kilmairn, Killowen, and his mother Sarah was from McGuire's Bridge, Enniskillen.

[2] After his father died in 1863, his mother operated a hotel at Queen's Wharf at Bathurst and Front Streets.

According to Orpen, keeping a book and writing a sheet for Toronto bookies "was not legal, and not quite illegal" at the time.

The two were dead set against paper contracts and worked without one until 1929 when another Orpen illness necessitated a statement of their business association.

In 1916, Orpen, along with partners Thomas Hare, Charles Millar and H. D. Brown opened the Kenilworth Park Racetrack in Windsor, Ontario.

In 1920, Orpen out-bid several racetracks to land a match race between Man o' War and Triple Crown winner Sir Barton at the track.

The event was so highly anticipated that it became the first horserace to be filmed in its entirety, with the resulting footage later shown in movie theatres across the country.

The race was originally intended to be a face-off between the three great horses of the time: Man o' War, Sir Barton and Exterminator.

In the 1920s, Orpen established the National Sporting Club gambling casino in Mimico, just outside the Toronto city limits on Lakeshore Road west of the Humber River.

"[2] In 1924, Orpen bought land in Etobicoke Township west of Toronto and opened the Long Branch Racetrack.

In 1935, Orpen, his son Fred and Hare arranged to hold races in London, Ontario, leasing the track at the Queen's Park fairgrounds.

On his 80th birthday, Orpen received congratulations from the Mayor of Toronto, the Premier of Ontario and the Prime Minister of Canada.

"[15] On July 31, 1937, Orpen had a heart seizure while in the Metropolitan Racing Association (MRA) offices at King and Bay Streets.

At the time of Orpen's death, his wife, two sons, Abraham Jr and Fred, and a daughter, Mrs T. Ambrose Woods, survived him.