Harvey C. Clark (September 7, 1869 – April 11, 1921) was an American attorney and military officer from Missouri.

A Democrat in politics, he served as prosecuting attorney of Bates County, Missouri for two terms beginning in 1896.

He accepted reduction in rank to brigadier general so he could lead Missouri troops on the U.S.–Mexico border in Texas during the 1916 Pancho Villa Expedition.

During the early days of World War I, he commanded the 60th Depot Brigade at Camp Doniphan, Oklahoma.

[6] He was a member of the Royal Arch Masons, Independent Order of Odd Fellows, Knights of Pythias, Elks, and Modern Woodmen of America.

[14][15] In 1888, Clark helped organize a unit of the Missouri National Guard, which was designated Company B, 2nd Infantry Regiment.

[6] In June 1897, Clark was promoted to major as quartermaster officer of the Missouri National Guard's 1st Brigade.

[16] In February 1899, Clark's wartime service was recognized with promotion to brigadier general and assignment as commander of the 1st Brigade.

[19][20] Clark's brigade performed border security near Laredo, Texas until mustering out of federal service in January 1917.

[21] With the army expanding for U.S. entry into World War I, during early 1917 Clark was responsible for recruiting and organizing Missouri National Guard units so they could be called to federal service.

[23][24] In December 1917, Clark failed his physical examination because he was diagnosed with high blood pressure, and he returned to Missouri.

[26] Clark also led the Missouri National Guard during its post-war reorganization and served as adjutant general until retiring in January 1921.

[29] In June 1897, Clark married Harriet "Hattie" De Armond, the daughter of Congressman David A.