Mark A. Hennig (born April 10, 1965, in Mansfield, Ohio) is an American Thoroughbred horse racing trainer.
Born into a horse racing family, his father, John Hennig, was also a trainer.
At the young of twenty-eight, Hennig went on to finish in the Nation's top ten Trainers with earnings over $4,000,000.
In 1995 Mark went on to form a public stable, largely due to the support of Edward P. Evans, for whom he won 45 graded stakes in his career.
Hennig has recently teamed up with several ownership groups, most notably the prestigious owners Donald and Donna Adam and their Courtlandt Farm Outfit.