Roscoe L. Koontz (December 16, 1922 – May 17, 1997) was an American Health Physicist. Trained as one of the first health physicists through the first Atomic Energy Health Physics Fellowship Training Program at the University of Rochester, Koontz contributed to the development of practices, instrumentation, and techniques to protect people from ionizing radiation. His early research focused on problems of neutron dosimetry, toxicology of uranium, plutonium, and fission products. Most of his career was spent at Atomics International where his key achievements included designing a pinhole gamma ray camera, developing techniques for measuring absolute thermal neutron flux using radioactive indium foils, and helping design and fabricate equipment to automate air and water sampling equipment and