Harold Emil ("Bud") Rohrschach, Jr. (1926 - 1993) was an American physicist. Born in Tulsa, Oklahoma. He joined the faculty of Rice University in 1952, and served there throughout his career. He was three times the chairman of the physics department and was principal investigator of the NASA interdisciplinary laboratory at Rice, which conducted research involving a wide range of studies on solid materials. After Rorschach's death, his widow established the Dr. Harold E. Rorschach, Jr. Endowed Undergraduate Research Award in Physics.