Sacred Heart Preparatory is an independent, private, Society of the Sacred Heart-affiliated college preparatory school in Atherton, California, United States. It was established in 1898 and is located at 150 Valparaiso Avenue across the street from Menlo Park. It is one of very few coeducational schools of the Sacred Heart in the United States and abroad; most are all-female. It has a student population of approximately 550 in grades 9 through 12.