| Safetynet Children And Youth Charities | Oakville |
| Safetynet Children And Youth Charities, Free Tutoring | Oakville |
| Salvation Army (The), Georgetown, Community and Family Services | Georgetown |
| Salvation Army (The), Acton, Community and Family Services | Acton |
| Salvation Army (The), Burlington - Mainway, Community and Family Services | Burlington |
| Salvation Army (The), Acton, Food Bank | Acton |
| Salvation Army (The), Burlington - Mainway, Community and Family Services - Food Bank | Burlington |
| Salvation Army (The), Georgetown, Food Bank | Georgetown |
| Salvation Army (The), Oakville, Food Bank | Oakville |
| Salvation Army, Khi Community (The), Milton, Community & Family Services, Food Bank | Milton |
| Salvation Army, Khi Community (The), Milton, Community and Family Services | Milton |
| Saplings Early Learning & Child Care Centre, Licensed Child Care Centre | Acton |
| Scouts Canada, Central Escarpment Council - Burlington Service Area | Burlington |
| Scouts Canada, Central Escarpment Council - Milton Service Area | Halton North |
| Scouts Canada, Central Escarpment Council - Oakville Service Area | Oakville |
| Scouts Canada, Online Service, Find a Scouts Group | Ontario |
| Sheridan College, Licensed Child Care Centre | Oakville |
| Shifra Homes, Maternity Residences | Burlington |
| Shine Foundation (The) | London |
| Silver Maple Montessori Private School, Licensed Child Care Centre | Milton |
| SimplySmart Child Care Centre & Montessori, Oakville - Iroquois Shore Rd, Licensed Child Care Centre | Oakville |
| SimplySmart Child Care Centre & Montessori, Oakville - Winston Churchill Blvd, Licensed Child Care Centre | Oakville |
| Skate Oakville | Oakville |
| Skiing, Snowboarding and Snowshoeing Locations, Halton Region | Ontario |
| Small Wunders Child Care Centre, Licensed Child Care Centre | Burlington |
| Smart Little Children Daycare Centre, Licensed Child Care Centre | Oakville |
| SMILE Canada, Support Services | Toronto |
| SocialliiASD | Burlington |
| Society of Saint Vincent de Paul Halton Particular Council, Burlington Conferences, Church Volunteer Outreach | Burlington |
| Society of Saint Vincent de Paul Halton Particular Council, Milton - Holy Rosary Conference, Church Volunteer Outreach | Milton |
| Society of Saint Vincent de Paul Halton Particular Council, Milton - St Benedict Conference, Church Volunteer Outreach | Milton |
| Society of Saint Vincent de Paul Halton Particular Council, Oakville Conferences, Church Volunteer Outreach | Oakville |
| SOS First Aid, First Aid and Safety Training | Halton Region |
| Southside Community Church | Milton |
| Southside Community Church, Milton, Food for Life Pop-Up Market | Milton |
| Special Olympics Ontario - Halton Region, Halton Hills Community, Special Olympics Ontario | Halton Hills |
| Special Olympics Ontario - Halton Region, Burlington Community - Mailing Address, Special Olympics Ontario | Burlington |
| Special Olympics Ontario - Halton Region, Milton Community, Special Olympics Ontario | Milton |
| Special Olympics Ontario - Halton Region, Oakville Community - Mailing Address, Special Olympics Ontario | Oakville |
| Speech and Stuttering Institute | Toronto |
| Sports Concept Recreational, Skating Lessons | Burlington |
| St Christopher's Anglican Church, Open Doors @ St Christophers | Burlington |
| St Christopher's Co-operative Preschool, Licensed Child Care Centre | Burlington |
| St Cuthbert's Anglican Church and Community Centre, Youth Tutoring Program | Oakville |
| St John Ambulance - Halton Region, Oakville Office, First Aid Instruction, Supplies and Community Services | Oakville |
| St John Ambulance - Halton Region, Burlington Office | Burlington |
| St Luke's Anglican Church, Palermo, Oakville, Nourishing Neighbours Food Bank | Oakville |
| Starlight Children's Foundation Canada | |
| Stirling Montessori Academy, Licensed Child Care Centre | Milton |
| Subject Tutoring and Homework Help Programs, Burlington | Burlington |
| Substance Canada, Parent Supports | Ontario |
| Summerhill Day School, Licensed Child Care Centre | Burlington |
| Sunnybrook Health Sciences Centre, Toronto - Sunnybrook Health Sciences Centre, Bayview Campus, Family Navigation Project | Toronto |
| Sunnybrook Health Sciences Centre, Toronto - Sunnybrook Health Sciences Centre, Bayview Campus, Youth Psychiatry | Toronto |
| Sweet Pea Daycare, Licensed Child Care Centre | Milton |
| Syyidah Aysha Centre, Milton Halal Food Bank | Milton |
