Robert Anacletus Underwood (born July 13, 1948) is an American politician and educator who served as the delegate from Guam to the United States House of Representatives from 1993 to 2003 as a member of the Democratic Party. He subsequently served as the president of the University of Guam from 2008 to 2018 and is currently a co-chair of the United States Institute of Peace China-Freely Associated States Senior Study Group.