Noor Muhammad Butt (Urdu: ڈاکٹر این ایم بٹ); b. 3 June 1936); SI, FPAS, best known as "Dr. N. M. Butt", is a Pakistani nuclear physicist and the professor of physics at the NUST Islamabad. He earned international prestige for his edge-leading research in neutron diffraction, and made important contributions to Mössbauer spectroscopy.