Francis Oliver "Frank" Haddock (November 14, 1892 – February 3, 1934) was an American police officer who, along with fellow patrolman Forbes McLeod (January 1, 1898 – February 2, 1934), was killed in the line of duty while responding to a bank robbery. They were the first two officers in Massachusetts state history to be murdered by an assailant using a sub-machine gun, and the crime attracted attention across the northeastern United States. Their sacrifices are commemorated by the city of Needham, Massachusetts through its Haddock-McLeod Plaza.