Noor Muhammad Butt (Urdu: نور محمد بٹ); b. 3 June 1936), PhD, DSc, SI, FPAS, also known as "N. M. Butt", is a Pakistani nuclear physicist and professor of physics at the Preston University who is known for his research publications in understanding the gamma-rays burst, Mössbauer effect, diffraction, later the nanotechnology.