Major General Leo Martin Boyle (July 20, 1899 – May 3, 1969) was a senior United States Army and Illinois National Guard officer.

[2] As the adjutant general, he was responsible for leading and coordinating the use of the Illinois National Guard in both territorial and federal matters.

Born in Chicago,[3] Boyle first enlisted in the US Army and Illinois National Guard in 1916 at the age of seventeen, taking part in the Pancho Villa Expedition.

It was in this position that as a captain he served with General George Marshall, who was assigned to the Illinois National Guard from 1933 until 1936 as the division's senior instructor.

He would later be exonerated in his beliefs when the Illinois National Guard was called up to quell the riots during the 1968 Democratic Convention.