| SHEPPARD SANITARY SEWER AT EAST DON STS | Wastewater Program | Growth Related C05 | CW | $373 |
| Sherbourne - O-Train Line West | active | — | — | — |
| Sheridan College - Hazel McCallion Campus Expansion Phase II | Complete | Growth Related C05 | 13 | $67.7M |
| Sheridan College - Partnering Across Boundaries: Bringing Global Leadership to Academic-Municipal Collaboration on District Energy | Complete | — | — | $21.4M |
| Shoreline Infrastructure | Parks, Forestry & Recreation | State of Good Repair C03 | CW | $7K |
| SickKids Center for Community Mental Health | Complete | Service Improvement and Enhancement C04 | 22 | $510K |
| Signal Systems - Various | Toronto Transit Commission | State of Good Repair C03 | CW | $35K |
| Silverheights Public Elementary School | Complete | State of Good Repair C03 | CW | $6.5M |
| Silverthorn Cycling Connections | active | cycling | — | — |
| Simcoe County Forest Trail Upgrade | Approved | — | — | $68K |
| Sioux Mountain Public Elementary School | Complete | State of Good Repair C03 | CW | $1.2M |
| Sioux North Public Secondary School | Complete | State of Good Repair C03 | CW | $23.8M |
| Sir Albert Love Catholic Elementary School | Complete | — | — | $252K |
| Sir Robert Borden Public Secondary School | Complete | State of Good Repair C03 | CW | $2.2M |
| Sir Sams Mountain Biking Trail Expansion | Approved | — | — | $10K |
| Sir Wilfrid Laurier Public Elementary School | Complete | State of Good Repair C03 | CW | $1.1M |
| Site Services/Final Cover/Storm Control | Solid Waste Management Services | Legislated C02 | CW | $4K |
| Ska:Na Family Learning Centre Northway | Complete | — | — | $2.1M |
| Sloane Avenue Road Safety Improvements | active | roads | — | — |
| SmartTrack Stations Program | Pre-Construction | Transit | — | $1.5B |
| Smith Public Elementary School | Complete | Service Improvement and Enhancement C04 | CW | $8.1M |
| Smooth Rock Falls | Approved | — | — | $4K |
| Social Enterprise for Canada Aurora EarlyON | Complete | — | — | $300K |
| Social Enterprise for Canada Woodbridge EarlyON | Complete | — | — | $225K |
| Sogr Leased Facilities/Properties 2024 | Corporate Real Estate Management | State of Good Repair C03 | CW | $800 |
| Somerville, CKL and Millenium Trail Project | Approved | — | — | $117K |
| South Bruce Asset Management Project | Approved | — | — | $4K |
| South Chatham Catholic Elementary School | Complete | — | — | $21.6M |
| South Huron Asset Management Project | Approved | — | — | $5K |
| South Kitchener Public Elementary School | Under construction | State of Good Repair C03 | CW | $23.8M |
| South March Public Elementary School | Complete | State of Good Repair C03 | CW | $4.7M |
| South Niagara Falls Elementary School | Planning | — | — | $14.0M |
| South Niagara Falls Public Elementary School | Under construction | State of Good Repair C03 | CW | $28.8M |
| South Stormont Asset Management Project | Approved | — | — | $5K |
| South/West Quadrant Watermain Replacement | Approved | — | — | $2.7M |
| Southeast Cambridge Public Elementary School | Under construction | State of Good Repair C03 | CW | $25.4M |
| Southeast Galt Catholic Elementary School | Under construction | — | — | $15.0M |
| Southeast London Elementary School | Planning | Growth Related C05 | CW | $28.2M |
| Southeast London Public Elementary School | Complete | Service Improvement and Enhancement C04 | CW | $16.1M |
| Southwest Agincourt Transportation Connections Study | active | — | — | — |
| Southwest London Public Elementary School | Under construction | Service Improvement and Enhancement C04 | CW | $28.8M |
| Southwold Asset Management Project | Approved | — | — | $4K |
| Special Events Consolidated Permitting Applicatio | Technology Services | Service Improvement and Enhancement C04 | CW | $194 |
| Specialized Fleet Expansion | Complete | Growth Related C05 | 13 | $394K |
| Spencer Avenue Public Elementary School | Complete | State of Good Repair C03 | CW | $2.6M |
| Spencer Valley Public Elementary School | Complete | Legislated C02 | CW | $0 |
| SPIF Community Parkland - Cummer Lodge | Seniors Services and Long-Term Care | State of Good Repair C03 | 18 | $611 |
| Spring Valley Public Elementary School | Complete | Legislated C02 | CW | $12.0M |
| Springbrook Public Elementary School | Complete | State of Good Repair C03 | CW | $14.6M |
| Springdale | Complete | — | — | $500K |