Douglas Howard Ginsburg is an American jurist and academic who serves as a judge on the United States Court of Appeals for the District of Columbia Circuit. He was appointed to that court in October 1986 by President Ronald Reagan and served as its chief judge from July 2001 until February 2008. In October 1987, Reagan announced his intention to nominate Ginsburg as an associate justice of the United States Supreme Court, but withdrew his name from consideration before being formally nominated, after his earlier marijuana use created controversy.

Ginsburg took senior status in October 2011 and joined the faculty of New York University School of Law in January 2012. In 2013, he left NYU and began teaching at George Mason University's Scalia Law School. He is the author of numerous scholarly works on antitrust and constitutional law