Romeo Marcus Williams (June 4, 1919 – August 16, 1960) was an American civil rights attorney who organized large-scale student protests against segregation in Marshall, Texas. He was also a junior partner of Dallas, Texas civil rights attorney, William J. Durham, who served as lead counsel on two landmark U.S. Supreme Court cases, Sweatt v. Painter (with famed civil rights attorneys Robert L. Carter and future U.S. Supreme Court Associate Justice Thurgood Marshall), and Smith v. Allwright.