James Fuller McKinley (February 22, 1880 – January 17, 1941) was an American military officer who served as Adjutant General of the United States Army from 1933 to 1935.

[3] On June 24, 1898, he enlisted for service in the Volunteers during the Spanish–American War and became a private in Company I, 8th Ohio Infantry Regiment.

[2] William McKinley was serving as president, and some friends suggested he appoint his nephews as officers, but they preferred to enlist so they would not be accused of receiving special treatment.

[2] The unit arrived in Siboney, Cuba on July 11, 1898, performed garrison duties, and departed in August after suffering several non-combat losses due to tropical diseases.

He participated in several engagements in the Sulu Archipelago, and received commendations from Generals Hugh L. Scott and Leonard Wood.

In August, he was promoted to temporary lieutenant colonel in the National Army as the armed forces began to expand its ranks for service in the war.

[1] McKinley reverted to his prewar rank of major in early 1920, and was assigned as district inspector general in charge of Reserve Officers' Training Corps affairs.

He was promoted to lieutenant colonel on July 1 and in September 1920 he was assigned as a district inspector general for the Fourth Corps Area with duty at Charleston Ordnance Depot, South Carolina and Fort McPherson, Georgia.

[5] McKinley served as the Adjutant General until retiring on October 31, 1935, and was succeeded by Edgar Thomas Conley.