Walter Estes Dellinger, III (born May 15,1941 in Charlotte, North Carolina) is the Douglas B. Maggs Professor of Law at Duke University and head of the appellate practice at O’Melveny & Myers in Washington, D.C. He also currently leads Harvard Law School's Supreme Court and Appellate Litigation Clinic. He served as the acting United States Solicitor General for the 1996-1997 Term of the Supreme Court. Prior to his appointment as acting Solicitor General, Dellinger was an Assistant Attorney General and head of the Office of Legal Counsel under President Bill Clinton. He has also appeared as a commentator on This Week, the ABC News Sunday morning program hosted by George Stephanopoulos. Dellinger is a graduate of the University of North Carolina at Chapel Hill and Yale Law School.
He is the father of lawyer and political candidate Hampton Dellinger.
On March 18, 2008, he unsuccessfully represented the District of Columbia before the United States Supreme Court in District of Columbia v. Heller. The District argued that its Firearms Control Regulations Act of 1975 should not be restricted by the Second Amendment. The ban was overturned by the Supreme Court.