Harry Lazarus (1839 – January 2, 1865) was an English-born American pugilist, saloon keeper, thief and underworld figure in New York City during the 1850s and early 1860s. He is sometimes confused with his father, famed pugilist Israel "London Izzy" Lazarus, and was one of his three sons along with John and Izzy Lazarus, Jr. His murder by Barney Friery, and subsequent trial, in 1865 was one of the most notorious crimes in the city's history prior to the end of the American Civil War.