Patrick David Gallagher (born March 29, 1963) is an American physicist and the eighteenth chancellor of the University of Pittsburgh.
He was formerly the 14th director of the U.S.
Department of Commerce's National Institute of Standards and Technology (NIST) and had served as the Acting United States Deputy Secretary of Commerce.
On February 8, 2014, he was named the Chancellor-elect of the University of Pittsburgh and assumed the position of Chancellor on August 1, 2014.