Charleston Collegiate School is accredited by the Southern Association of Independent Schools (SAIS) and the Southern Association of Colleges and Schools (SACS). The school is a member of:

Coalition of Essential Schools (CES)

Educational Records Bureau (ERB)

National Association of Independent Schools (NAIS)

National Center for Independent School Renewal (NCISR)

Palmetto Association of Independent Schools (PAIS)
Charleston Collegiate's Head of School, Bob Shirley, currently serves as President of PAIS.

South Carolina Independent School Association (SCISA)

Southern Association for College Admission Counseling (SACAC)

Southern Association of Colleges and Schools (SACS)

Southern Association of Independent Schools (SAIS)

Tri-County Admissions Council (TCAC)
Charleston Collegiate's Admission Director, Hacker Burr, currently serves as President of TCAC.