Harry Kearsarge Knapp (September 25, 1864 - January 31, 1926) was a United States financier and a prominent executive in the Thoroughbred horse racing industry in which he had been a steward, secretary-treasurer and vice-chairman of The Jockey Club. A graduate of Columbia University, he was a partner with George Hyatt and John S. Van Siclen in the New York City stock brokerage firm, Hyatt & Co. and later a partner in Benedict Drysdale & Co. Harry Knapp was also a director of the Corn Exchange Bank of New York and was the head of the Racquet and Tennis Club.