Richard Sprigg Steuart (1797–1876) was a Maryland physician and an early pioneer of the treatment of mental illness. In 1838 he inherited four contiguous farms, totalling approximately 1900 acres as well as 150 slaves. Steuart was instrumental in the expansion and modernisation of The Maryland Hospital for the Insane, today known as the Spring Grove Hospital Center. The expansion of the hospital, which Steuart considered his life's work, was authorized by the Maryland legislature in the 1850s and completed after the end of the Civil War.