Henry Frederick "Harry" Barrett (30 December 1879 – 18 December 1927) was a British long-distance runner who on 8 May 1909 set a world's best in only his second marathon with a time of 2:42:31 at the Polytechnic Marathon. Barrett failed to finish the men's marathon at the 1908 Summer Olympics and 1912 Summer Olympics.
Barret was an electrician from Hounslow.