James Arthur "Jim" Krumhansl (August 2, 1919 – May 6, 2004) was an American physicist who specialized in condensed matter physics and materials science. He spent much of his career at Cornell University. He also served as president of the American Physical Society and assistant director for mathematics, physical sciences, and engineering for the National Science Foundation. In 1987 he testified before Congress that the Superconducting Super Collider would be too costly.