Bob Armstrong (September 4, 1873 – January 5, 1933), was a heavyweight boxer known as the "King of the Battle Royal". He was born in Rogersville, Tennessee, but he moved with his family to Washington, Ohio when he was three years old. Before he got into boxing, Armstrong worked with racing horses in Minneapolis, Minnesota. He made his debut on September 19 in a six-rounder against Joe Choynski in Chicago, Illinois. He lost the decision on points.