John McTaggart (1896 – April 18, 1946) was an American Champion jockey in the sport of Thoroughbred horse racing.

McTaggart rode in the Kentucky Derby twice with his best result a second in the 1917 edition aboard Andrew Miller's colt, Ticket.

Among his other successes, McTaggart rode in Canada where he notably was a three-time winner of that country's premier race for two-year-olds, the Coronation Futurity Stakes at Old Woodbine Racetrack.

Afflicted with tuberculosis, John McTaggart died at age fifty in 1946 at a sanitarium in Pikesville, Maryland.

[1] His brother Tommy, also a former top jockey, had died a few months earlier in February 1946 in a paddock accident while working at Hialeah Park Race Track in Florida.