Paul Gregory Kwiat is an American physicist.

He got a doctorate from the University of California, Berkeley in 1993. His advisor was Raymond Chiao, and he wrote a dissertation titled Nonclassical effects from spontaneous parametric down-conversion: Adventures in quantum wonderland. After earning his doctorate, Kwiat worked as a postdoc with Anton Zeilinger at the University of Innsbruck for two years. Later, he worked at the Los Alamos National Laboratory until 2001. That year, he started teaching at the University of Illinois Urbana–Champaign as the John Bardeen Chair in Electrical Engineering and Physics.

In 2001, the American Physical Society made Kwiat a fellow. This was because of his work developing techniques using light to study the foundations of quantum physics and how these techniques are used in research about quantum information. In 2009, Kwiat received the R. W. Wood Prize from Optica. He is also a fellow of Optica.