Gary D. Solis (born 1941) is a veteran of the U.S. Marine Corps and an Adjunct Professor of Law who teaches the laws of war at the Georgetown University Law Center. He is an expert on the laws of war. He attended San Diego State University (B.A), the University of California, Davis School of Law (J.D.), George Washington University Law School (LL.M.), and the London School of Economics and Political Science (Ph.D.). Before his academic career, Solis served two tours of duty during the Vietnam War in the United States Marine Corps. He is a former military judge advocate and Marine prosecutor.