Juan José Nieto Roig (born 1958, A Coruña) is a , Professor of Mathematical Analysis at the University of Santiago de Compostela since 1991 and a Royal Galician Academy of Sciences Fellow. His most influential contributions to date are in the area of differential equations. Nieto received his degree in Mathematics at the University of Santiago de Compostela in 1980. He was awarded a Fulbright scholarship and proceeded to the University of Texas at Arlington where he worked with professor . He received his Ph.D. in Mathematics at the University of Santiago de Compostela in 1983.