Charles Ruggles Boardman (October 28, 1860 – April 5, 1950) was an American journalist, businessman, and Army National Guard officer.

He served 16 years as Adjutant General of Wisconsin (1897–1913) and commanded the 64th Brigade of U.S. Infantry during World War I.

On January 4, 1897, he was appointed Adjutant General of Wisconsin by Governor Edward Scofield.

He transferred to the National Guard Reserve on May 1, 1917, and was given command of the First Wisconsin Infantry Brigade.

He served for a total of thirty-eight years and was one of the oldest American general officers during World War I.

[4] Boardman's maternal grandfather was Nathaniel P. Tallmadge, who served as a United States senator from New York and was the 3rd Governor of the Wisconsin Territory.