| OLIVARIA, ENRIQUE | PART-TIME PARKING ENFORCEMENT OFFICER | Transportation, Traffic & Parking | |
| OLAVARRIA, GERALDO | TRAFFIC MAINTENANCE WORKER | Transportation, Traffic & Parking | |
| Okwuosa, Kenechukwu | Coordinator for Office of Violence Prevention | Community Services Administration | (203) 946-5757 |
| O'Hair, James | Library Building Superintendent | Public Library | (203) 946-7456 |
| O’Neal, Mezan | Payroll/Benefit Auditor | Finance – Payroll & Pension | (203) 946-6340 |
| O’Leary, Jeffrey | Property Appraiser / Assessor | Assessor’s Office | (203) 946-4974 |
| Nuzzo, Elissa | Municipal Civil Engineer | Engineering | (203) 946-8354 |
| NOTGHI, BIJAN | DEPUTY DIRECTOR - OPERATION | Transportation, Traffic & Parking | (203) 946-8069 |
| Nieves-Winn, Anna | Community Outreach Coordinator | Economic Development Administration | (203) 946-8387 |
| Natalino, Arthur | Project Manager | Housing & Development Administration | (203) 946-7858 |
| Napolitano, Marlene | Republican Registrar of Voters | Registrar of Voters | (203) 946-6429 |
| Mustakos, Steve | Superintendent of Streets | Public Works Department | (203) 946-6134 |
| Murphy, Warren | Housing Code Inspector | Livable City Initiative | (203) 946-2287 |
| Munroe, Taylor | Neighborhood Specialist | Livable City Initiative | (203) 846-7888 |
| Mujahid, Isa | Lead Poisoning Inspector | Health Department | (203) 800-6265 |
| Morrison, Kirk | Branch Manager-Fair Haven | Public Library | (203) 946-8116 |
| Moreno, Jeffrey | Project Manager | Housing & Development Administration | (203) 946-7731 |
| Moran, Kaelie | Planner II | City Plan | (203) 946-7842 |
| Morales, Jacqueline | Medical Benefits / Wellness Analyst | Human Resources | |
| Moore-Fox, Lisa | Executive Administrative Assistant | Economic Development Administration | (203) 946-2366 |
| Montagna, Joseph | Accountant IV | Finance Department | (203) 946-6973 |
| Monaco, Sumalee | Administrative Asstistant | Livable City Initiative | (203) 946-4997 |
| Mixsell, Anastasia | Tree System Coordinator | Parks Department | (203) 946-8092 |
| Mitra, Soma | Young Minds & Family Learning | Public Library | (203) 946-8132 |
| Mitchell, Tracey | Title Maintenance Clerk | Assessor’s Office | (203) 946-2323 |
| Mitchell, Lorena | Coordinator Office of Community Health Initiatives | Community Services Administration | (203) 946-6759 |
| Mitchell, Darina | Community Liaison Trainer | Community Services Administration | (203) 909-0983 |
| Miranda-Noad, Maria | Executive Administrative Assistant | Community Services Administration | (203) 946-4943 |
| Miranda-Foreman, Noemi | Paralegal | Economic Development Administration | (203) 946-2569 |
| Milone, Lisa | Republican Voters Clerk | Registrar of Voters | (203) 946-7519 |
| Milling, Farris | Office Manager | Health Department | (203) 946-8191 |
| Mignosa, Robert | Management & Policy Analyst | | (203) 946-6342 |
| Mezzanotte, Lisa | Supervisor of Management Services | Police Services | (203) 946-6959 |
| Merly, Joseph | Asst. Corp. Counsel | Corporation Counsel | (203) 946-7921 |
| Mendez, Carmen | Neighborhood Specialist | Livable City Initiative | (203) 946-7733 |
