Charles Hedges McKinstry (December 19, 1866 – November 29, 1961) was an engineer and army officer for the United States Military.

He attended the United States Military Academy and graduated in 1888, number two of forty-four in his class.

[2] After becoming a major, McKinstry went on to be in charge of defensive works and harbors improvements in Key West from 1898 to 1900.

[2] From 1901 to 1903, he was at the Engineer School in Willets Point, New York, as an instructor, which included instruction in astronomy.

[2] On February 27, 1912, he was promoted to brigadier general and then became commander of the 158th Field Artillery Brigade on August 5, 1917.