St. Stephen’s is a full member of the Florida Council of Independent Schools (FCIS), the chief accrediting body for independent schools in Florida, and the FKC, Florida Kindergarten Council. The Day School is also a member of the following professional organizations.
- American Library Association
- Council for Advancement and Support of Education (CASE)
- Dade Association for Academic Non-Public Schools (DAANS) now Independent Schools of South Florida (ISSF)
- Dade County Council for Teachers of Mathematics (DCCTM)
- Diocese of Southeast Florida Episcopal Schools
- Educational Records Bureau/Independent School Entrance Exam (ERB/ISEE)
- Florida Association of Computer Educators (FACE)
- International Society for Technology in Education (ISTE)
- National Association for the Education of Young Children (NAEYC)
- National Association of Episcopal School (NAES)
- National Association of Independent Schools (NAIS)
- National Council for Teachers of Math (NCTM)
- National Council of Teachers of English (NCTE)
- National Science Teachers Association (NSTA)
- Secondary School Admission Test Board (SSATB)
- South Florida Association for the Education of Young Children (SFAEYC)
- The International Reading Association (IRA)
