Margaret Joy Tibbetts (August 26, 1919 – April 25, 2010) was an American diplomat. A career Foreign Service Officer, she was the United States Ambassador to Norway from 1964 to 1969 under President Lyndon Johnson. She attended Gould Academy, Wheaton College in Massachusetts and her Ph.D. from Bryn Mawr College. She was awarded an honorary degree from Bates College in 1962 and Bowdoin College in 1973.