Lincoln Palmer Bloomfield Jr. (born 1952)[1] is an American diplomat and national security adviser who served as Assistant Secretary of State for Political-Military Affairs in the George W. Bush administration, and as Dan Quayle's Assistant for National Security Affairs.

Upon graduation, Bloomfield joined the office of the Assistant Secretary of Defense for International Security Affairs.

In 1988 and 1989, he served as Principal Deputy Assistant Secretary of Defense for International Security Affairs.

In February 2005, Bloomfield founded Palmer Coates LLC, a consulting firm specializing in strategic planning for international business activities.

Bloomfield spent 2008 and 2009 working as President Bush's special envoy for man-portable air-defense systems threat reduction.