Henry Joseph Reilly (April 29, 1881 – December 13, 1963) was an American soldier and journalist who, after seeing combat in World War I, helped found the Reserve Officers Association.

[1] His father Henry Joseph Reilly Sr. died in the 1900 Battle of Peking during the Chinese Boxer Rebellion, and his family moved to Winnetka, Illinois, soon afterward.

[2] In the years leading up to World War I, Reilly served in Asia and Europe, and he also wrote a weekly military column for the Chicago Tribune.

When America entered the war in 1917, Reilly, by then a colonel, had assumed command of the 149th Field Artillery Regiment of the 42nd ("Rainbow") Division.

[6][7]After the war, Reilly became a brigadier general in the Officer Reserve Corps and a well-known speaker, writer, journalist, and editor on military affairs.