Sacred Heart-Griffin High School is Springfield, Illinois' largest private high school.
It opened in the fall of 1988 after Sacred Heart Academy, an all-girls Catholic high school merged with Griffin High School, an all-boys Catholic High School located across the street.
The part of campus which formerly housed Griffin High School is now known as the West Campus. The part of campus which was home to Sacred Heart Academy is known as the East Campus. Both facilities are used by SHG, with most of the school's athletic facilities being located on the West Campus and the majority of the academic facilities being located on the East Campus. On the school's East Campus is a motherhouse for a Dominican order of religious sisters.