Charleston Collegiate School is accredited by national, regional, and local associations. School accreditation and memberships include the following:

SAIS (Southern Association of Independent Schools)
NAIS (National Association of Independent Schools)
NCISR (National Center for Independent School Renewal)
CES (Coalition of Essential Schools)
ERB (Educational Records Bureau)
SCISA (South Carolina Independent School Association)
Tri-County Admissions Council