Delma S. Arrigoitia, PhD, J.D., (born February 10, 1945) is a historian, author, educator and lawyer whose written works cover the life and works of some of Puerto Rico's most prominent politicians of the early 20th century. Arrigoitia was the first person at the University of Puerto Rico to earn a Master's Degree in the field of history. After earning her doctorate in history at Fordham University in New York, she helped develop the graduate school for history at the University of Puerto Rico and taught there for years.