María Arrillaga is a Puerto Rican poet who has been a professor at the University of Puerto Rico. She taught in the Spanish Department on the Rio Piedras campus. She is a member of PEN American Center as well as PEN Club de Puerto Rico. She was a member of the Women's Writing Committee of PEN International, served as its secretary and organizer for Latin America. Arrillaga was president of PEN Club de Puerto Rico during 1989-1991.She is the author of several collections of poetry.