Diego Ernesto Castrillón Martinez (born 8 January 1975, in Montevideo) is a former Uruguayan professional basketball player, coach and basketball teacher in Colegio Seminario. During his playing career, at a height of 2.00 m (6'6 3⁄4") tall, he played at the small forward and power forward positions. He was the Uruguayan League MVP and Uruguayan League Finals MVP, in 2003.