Eugene Joseph Dionne Jr. (/diˈɒn/) is an American journalist, political commentator, and long-time op-ed columnist for The Washington Post.

He is also a senior fellow in governance studies at the Brookings Institution, a professor in the Foundations of Democracy and Culture at the McCourt School of Public Policy of Georgetown University, and an NPR, MSNBC, and PBS commentator.

He is the son of the late Lucienne (née Galipeau), a librarian and teacher, and Eugène J. Dionne, a dentist.

Dionne graduated in 1973 with a B.A., summa cum laude, in social studies from Harvard University, where he was elected to Phi Beta Kappa and was affiliated with Adams House.

Dionne lives in Bethesda, Maryland, with his wife, Mary Boyle; they have three children: James, Julia, and Margot.