Michael A. Hammer (born December 26, 1963) is an American diplomat who was the United States Ambassador to Chile. He was confirmed by the United States Senate on March 6, 2014, and sworn in on March 7, 2014. He was nominated to be the next ambassador to the Democratic Republic of the Congo by President Donald Trump on June 20, 2018, and confirmed by the Senate on September 6, 2018.