Eugene R. Fidell (born March 31, 1945) is an American lawyer and notable expert in military law. He is currently a visiting Professor of Military Law at Yale University.

Fidell is a senior partner with Feldesman Tucker Leifer Fidell llp. He joined the firm in 1984. He is also asked to serve as a commentator on military law on TV. Since 2006 he has been an Adjunct Professor at Washington College of Law. He has been a visiting lecturer at Harvard Law School and Yale Law School. Fidell is currently the President of the National Institute of Military Justice.

Fidell has been a critic of the Bush Presidency's policy on captives taken in the "war on terror".