Santiago Enrique Grillo Diez (born May 27, 1987 in Cali), known as Santiago Grillo, is a Colombian windsurfer who specialized in Neil Pryde RS:X class. A two-time Olympian (2008 and 2012), he is ranked no. 82 in the world for the sailboard class by the International Sailing Federation. Grillo also trains for Velas y Vientos in Cali under his Argentina-based personal coach Manuel Fumagallo. Grillo made his debut at the 2008 Summer Olympics in Beijing, where he finished last out of thirty-five sailors in the men's RS:X class with a net score of 293.