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- School Nursing Service (Southend-on-Sea)
- SNAP (Special Needs and Parents)
- South East Essex Epilepsy Support Group
- Southend Association of Voluntary Services (SAVS)
- Southend Blind Welfare Organisation (inc Southend in Sight)
- Southend Essex and Thurrock Child and Adolescent Mental Health Service (SET CAMHS)
- Southend Mencap Advocacy Service
- Southend Vineyard
- Southend Young Carers - Emotional support & fun activities for Young Carers aged 5-17 years old!
- Stonewall
- STRM (SEND the Right Message) Charity
- SUMMIT Autism Navigation and Advocacy Service
- Sutton House Academy (PLT Southend)