Joseph Keith Kellogg Jr. is a former United States government official and a retired lieutenant general in the United States Army. He previously served as the National Security Advisor to Vice President Mike Pence, and as the Executive Secretary and Chief of Staff of the United States National Security Council in the Trump administration. He served as National Security Advisor on an acting basis following the resignation of Michael T. Flynn.

The Assistant to the President for National Security Affairs (APNSA), commonly referred to as the National Security Advisor (NSA), is a senior aide in the Executive Office of the President, based at the West Wing of the White House. The national security advisor serves as the principal advisor to the President of the United States on all national security issues.