Fayyazuddin, also spelled as Fayyaz Uddin, is a Pakistani theoretical physicist, emeritus professor, specialising in theoretical physics and mathematical physics at Quaid-e-Azam University campus National Centre for Physics, Islamabad. He is a senior scientist at the National Center for Physics. Fayyaz conducts research in the fields of quantum mechanics, particle physics, and meson physics. He has published numerous physics papers accompanied by Riazuddin and has co-authored Quantum Mechanics by Fayyazuddin and Riazuddin published in 1990.