| Abbreviation | Definition |
|---|---|
| MPW | Municipal Plastic Waste |
| MPWT | Ministry of Public Works and Transportation |
| MRAT | Municipal Risk Assessment Tool |
| MRC | Municipal Review Committee |
| MREP | Municipal Roads for the Economy Program |
| MRF | Municipal Recycling Facility |
| MRGP | Municipal Road General Permit |
| MRGP | Municipal Roads General Permit |
| MROO | Municipal Retirees Organization of Ontario |
| MROO | Municipal Retirees Organization Ontario |
| MRSC | Municipal Research and Services Center |
| MSB | Municipal Services Bureau |
| MSDA | Municipal Services Development Agency |
| MSEU | Municipal Support Enforcement Unit |
| MSGS | Municipal Smart Grid Summit |
| MSLW | Municipal Solid and Liquid Waste |
| MSLW | Municipal Solid and Liquid Wastes |
| MSPW | Municipal Solid Plastic Waste |
| MSRB | Municipal Securities Rulemaking Board |
| MSRW | Municipal Solid Refuse Waste |