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- SAFE (Supporting Asperger Families in Essex)
- Scorpions Basketball
- SEN Club East Hanningfield
- SEN sessions at Partyman World of Play
- SEND Our Way
- SEND Surgeries
- SENDsocial
- Sibs - for brothers and sisters of disabled children and adults
- Sign Away BSL
- Smart Play for Toddlers (Christ Church)
- SNAP (Special Needs and Parents)
- Southend Central Museum
- Southend Combat Academy
- Southend Early Autism Support (SEAS) Course
- Southend Mencap - 16+ Club
- Southend Mencap - Family Play and Respite Club
- Southend MENCAP family support service
- Southend Mencap Music School
- Southend Mencap Showstoppers
- Southend Planetarium
- Southend SEND Independent Forum (SSIF) including Coffee and Chat sessions
- Southend SEND Youth Voice
- Southend Soccability Football Club
- Southend Theatres Community and Education Department
- Southend United Community Foundation - Pan disability football sessions
- SouthSEND Rugby
- STRM (SEND the Right Message) Charity
- STRM – Bouldering session
- Supporting Families Team
- Sycamore Youth Group