Paul George Cassell (born 1959) is a former United States federal judge.
Born in Orange, California in 1959, Cassell received a B.A. from Stanford University in 1979. He later received a J.D. from Stanford Law School in 1984. He was a law clerk for the Hon. Antonin Scalia, U.S. Court of Appeals, D.C. Circuit from 1984 to 1985. He was a Law clerk for Chief Justice Warren E. Burger, Supreme Court of the United States from 1985 to 1986. He was an Associate deputy attorney general of U.S. Department of Justice, Washington, DC from 1986 to 1988. He was an assistant U.S. Attorney of the Eastern District of Virginia from 1988 to 1991. He was a Professor of law at the S.J. Quinney College of Law at the University of Utah from 1992 to 2002 and from 2007 to the present.
Cassell was a federal judge on the United States District Court for the District of Utah. Cassell was nominated by President George W. Bush on September 4, 2001, to a seat vacated by David Sam. He was confirmed by the United States Senate on May 13, 2002, and received his commission on May 15, 2002. Cassell served in that capacity until November 5, 2007, due to resignation.