Robert D. Blackwill is a retired American diplomat, author, senior fellow, and lobbyist. He currently holds positions as a Distinguished Visiting Fellow at the Hoover Institution and a Senior Fellow at the Belfer Center for Science and International Affairs at Harvard University. He is also a senior fellow at the Council of Foreign Relations.

Blackwill's distinguished career includes serving as the United States Ambassador to India under President George W. Bush from 2001 to 2003.