John Andrew Eisenberg is an American lawyer who has served as the United States assistant attorney general for the National Security Division since June 2025. He previously served as a deputy counsel to the President of the United States and legal advisor to the U.S. National Security Council during the first presidency of Donald Trump. He was selected by former National Security Advisor Michael Flynn. Earlier in his career, from 2006 to 2009, he served in the Department of Justice.