Martin David Ginsburg was an American lawyer who specialized in tax law and was the husband of American lawyer and U.S. Supreme Court Justice Ruth Bader Ginsburg. He taught law at Georgetown University Law Center in Washington, D.C. and was of counsel in the Washington, D.C. office of the American law firm Fried, Frank, Harris, Shriver & Jacobson. He featured in the biographical drama RBG (2021).