Charleston Collegiate School (formerly Sea Island Academy) is a co-educational, nonsectarian, independent day school in Johns Island, South Carolina, United States near the city of Charleston.

It was founded in 1970 under the name Sea Island Academy and in 2002 became Charleston Collegiate School.

[2] When the school first opened, classes were held in a local Episcopal church.

It offers basketball, cheerleading, cross country running, football, tennis, archery, baseball, soccer, and volleyball.

In 2000, Sea Island Academy started a 90% scholarship program in order to increase minority enrollment.