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- Saint Cedd's (lifestreams) Youth club (led by Early Help Family Support)
- Samantha Boyd School of Dance
- Saturday Youth Club at Shoebury Youth Centre (EHFSYOS)
- Scouts, Beavers and Cubs - 1st Prittlewell
- Scouts, Beavers and Cubs - 1st Shoeburyness
- Scouts, Beavers and Cubs - 2nd Prittlewell (St. Lukes)
- Scouts, Beavers and Cubs - 2nd Southchurch
- Scouts, Beavers and Cubs - 2nd Southend
- Scouts, Beavers and Cubs - 3rd Southchurch
- Sea Cadets Southend
- SENDsocial
- Senior Youth Club (Friday) at Shoebury Youth Centre (EHFSYOS)
- Seniors Session at St Luke's Hub (11-18 year olds) - EHFSYOS
- Shoeburyness Leisure Centre
- Shoeburyness Library
- Sing and Sign (throughout The City of Southend-on-Sea))
- Singer Stage School
- Singing and Toddling at St. Mark's Church
- Singing and Toddling at The Haven Community Hub
- Singing and Toddling at Trinity Methodist Church
- Smart Play for Toddlers (Christ Church)
- Snakes Alive - The Interactive Reptile Party Experience
- Songs and Smiles for 0-4 year olds and their grownups
- Southchurch Hall Museum and Gardens
- Southchurch Library
- Southchurch Park
- Southend Advantage Card
- Southend Central Museum
- Southend Choirs
- Southend Duke of Edinburgh Open group
- Southend Golf Club Cadets (Belfairs)
- Southend Leisure and Tennis Centre
- Southend Leisure and Tennis Centre - Tots Tennis
- Southend Mencap - Family Play and Respite Club
- Southend Parks Tennis Programme
- Southend Photographic Society
- Southend Pier
- Southend Planetarium
- Southend Theatres Community and Education Department
- Southend Youth Council
- Southend Youth Services Youth Groups - Integrated Children, Youth and Family Support Services
- Southend-on-Sea Boys Choir
- Southend-on-Sea Girls Choir
- Southend-on-Sea Sealife Adventure
- Southend-on-Sea Swimming Club
- Sparklers Toddler Group (Christ Church)
- St Andrew's Tiddlers Parent and Toddler Group