Donald Paul Merrifield, S.J., Ph.D. (November 14, 1928 – February 25, 2010) was an American Jesuit who served as the 11th president of Loyola University of Los Angeles. He became the first president of Loyola Marymount University president upon Loyola University's merger with Marymount College in 1973 and remained as the school's president until 1984. Under Merrifield, Loyola Marymount went through a period of rapid expansion in which thirteen new buildings were constructed on the main campus.