Young Peter Jackson (31 October 1877 – 14 September 1923) was a boxer active between 1895 and 1914.

During his career, he was able to achieve victories over some of the most storied fighters of all-time, including Sam Langford, Barbados Joe Walcott, Philadelphia Jack O'Brien, and Mysterious Billy Smith.

He also squared off against the legendary Jack Johnson in a bout for the latter's World "Colored" Heavyweight Title.

Born Sim Thompkins in Baltimore, Maryland,[1] he named himself after the great colored heavyweight bare-knuckle champ Peter Jackson when he became a practitioner of the sweet science.

Known as "The Baltimore Demon", the 5'6" boxer fought at a weight of between 148 and 160 lbs.