| Massey Centre ELC | Complete | Service Improvement and Enhancement C04 | 22 | $510K |
| Massey Public Elementary School | Complete | Service Improvement and Enhancement C04 | CW | $2.0M |
| Mattawan Asset Management Project | Approved | — | — | $3K |
| May Court Child Care | Complete | Growth Related C05 | 19 | $1.3M |
| Mayfield West #2 Public School | Under construction | Service Improvement and Enhancement C04 | CW | $32.5M |
| McCaskill's Mills Public Elementary School | Complete | State of Good Repair C03 | CW | $504K |
| McClure Public Elementary School | Complete | Service Improvement and Enhancement C04 | CW | $13.4M |
| McDougall Asset Management Project | Approved | — | — | $4K |
| McGarry Asset Management | Approved | — | — | $4K |
| McKellar Asset Management Project | Approved | — | — | $1K |
| McMaster Children's Hospital - New Ron Joyce Children's Health Centre | Complete | Service Improvement and Enhancement C04 | CW | $86.0M |
| McMaster University - Arthur Bourns Building - Repair, Retrofit, Addition, Campus COGEN | Complete | State of Good Repair C03 | CW | $78.2M |
| McMaster University - L.R. Wilson Hall for Studies in Humanities and Social Sciences | Complete | — | — | $45.5M |
| McNab/Braeside Asset Management Project | Approved | — | — | $4K |
| Meadows North Public Elementary School | Complete | State of Good Repair C03 | CW | $12.1M |
| Meadowvale Public Secondary School | Complete | Service Improvement and Enhancement C04 | CW | $1.6M |
| Meaford Asset Management Project | Approved | — | — | $5K |
| Memorial Public Elementary School | Complete | Service Improvement and Enhancement C04 | CW | $12.0M |
| Mer Bleue Elementary School | Planning | State of Good Repair C03 | CW | $20.3M |
| Merivale Public Secondary School | Complete | State of Good Repair C03 | CW | $3.1M |
| MF#02 - COVID Surcharge and NetZero - Adjustment | Toronto Paramedic Services | Growth Related C05 | 21 | $16K |
| MH - Audio System - Microphones & Accessories | TO Live | State of Good Repair C03 | 13 | $84 |
| MH - BCA Recommendations (Future) | TO Live | State of Good Repair C03 | 13 | $18K |
| Michaëlle-Jean Public Elementary School | Complete | State of Good Repair C03 | CW | $10.4M |
| Mid Humber Gap Trail Study | active | cycling | — | — |
| Mid-Town Toronto Storm Sewer Relief | active | water-sewer | — | — |
| Middlesex Centre - Asset Management Project | Approved | — | — | $5K |
| Middlesex Centre Catholic Elementary School | Under construction | Service Improvement and Enhancement C04 | CW | $23.6M |
| Millbrook-South Cavan Public Elementary School | Complete | State of Good Repair C03 | CW | $3.5M |
| Milton 10 Catholic Elementary School | Complete | Legislated C02 | CW | $17.2M |
| Milton 11 Catholic Elementary School | Under construction | Legislated C02 | CW | $36.8M |
| Milton 9 Catholic Elementary School | Complete | Legislated C02 | CW | $23.9M |
| Milton District High School | Planning | State of Good Repair C03 | 10 | $26.4M |
| Milton SE 13 Public Elementary School | Planning | Service Improvement and Enhancement C04 | CW | $24.3M |
| Milton SW 11 Public Elementary School | Complete | Service Improvement and Enhancement C04 | CW | $18.8M |
| Milton SW 12 Public Elementary School | Complete | Service Improvement and Enhancement C04 | CW | $20.7M |
| Milverton Public Elementary School | Under construction | Service Improvement and Enhancement C04 | CW | $2.8M |
| Mimico Creek Restoration and Water Infrastructure Protection Study | active | — | — | — |
| Mimico Neighbourhood Mobility Plan | active | — | — | — |
| Minden | Complete | — | — | $750K |
| Minden Hills Asset Management Project | Approved | — | — | $4K |
| Minwaashin Lodge | Complete | — | — | $1.0M |
| Missisauga Bus Rapid Transit - Metrolinx Segment | Approved | — | — | $24.0M |
| MM Robinson Public Secondary School | Complete | Service Improvement and Enhancement C04 | CW | $6.6M |
| MM18.11 Draper Streetscape Improvements | Transportation Services | Service Improvement and Enhancement C04 | 10 | $500 |
| MM44.36 N.I. George Street Streetscape | Transportation Services | Service Improvement and Enhancement C04 | 13 | $292.15 |
| Mobile Data Collector 2 - EH&SC assessments | Solid Waste Management Services | Service Improvement and Enhancement C04 | CW | $352 |
| Modular Housing Initiative | Active | Housing | — | $212.0M |
| Mohawk College - Partnership and Innovation Centre | Complete | Service Improvement and Enhancement C04 | CW | $0 |
| Molly Brant Public Elementary School | Complete | State of Good Repair C03 | CW | $10.3M |