Charles Harley Mansur (March 6, 1835 – April 16, 1895) was a U.S. Representative from Missouri.

Born in Philadelphia, Pennsylvania, Mansur attended Lawrence Academy, Groton, Massachusetts.

He studied law and was admitted to the bar in Richmond, Missouri, August 30, 1856.

He was appointed by President Cleveland as second Comptroller of the Treasury on May 29, 1893, and served until September 30, 1894.

He was interred in Sunny Slope Cemetery, Richmond, Missouri.