Joseph J. Leonard (May 8, 1876 – August 20, 1962) was an American political figure who served as Commissioner of the Boston Police Department for 58 days.

[5] The committee voted 4 to 1 against Goodwin's motion to request a legal ruling on the dispute from the Massachusetts Attorney General and Leonard became chairman.

[2] On December 27, 1934, outgoing Governor Ely appointed Leonard to a five-year term as Boston Police Commissioner.

Leonard resigned on February 19, 1935, one day before the Massachusetts Governor's Council was to begin hearing's on Curley's request to remove him from office.

[2] 1 After his resignation as police commissioner, Leonard stated that he did not intend to accept another government position and returned to his law practice.