| Phnom Penh Monticello | Eastern Time | 11:00 |
| Phnom Penh Montpelier | Eastern Time | 11:00 |
| Phnom Penh Montreal | Eastern Time | 11:00 |
| Phnom Penh Montreal East | Eastern Time | 11:00 |
| Phnom Penh Nala Sopara | India Standard Time | 01:30 |
| Phnom Penh Montrose | Atlantic Time | 11:00 |
| Phnom Penh Náměšť nad Oslavou | Central European Time | 05:00 |
| Phnom Penh Namur | Central European Time | 05:00 |
| Phnom Penh Nanded-Waghala | India Standard Time | 01:30 |
| Phnom Penh McKinnon | Eastern Australia Time | -03:00 |
| Phnom Penh McCammon | Mountain Time | 13:00 |
| Phnom Penh Meadow Lake | Central Time | 13:00 |
| Phnom Penh McMurray | Eastern Time | 11:00 |
| Phnom Penh McRae | Eastern Time | 11:00 |
| Phnom Penh Mdina | Central European Time | 05:00 |
| Phnom Penh Mbour | Greenwich Mean Time | 07:00 |
| Phnom Penh Medfield | Eastern Time | 11:00 |
| Phnom Penh Media | Eastern Time | 11:00 |
| Phnom Penh Medina | Western Australia Time | -01:00 |
| Phnom Penh Mecina-Fondales | Central European Time | 05:00 |
| Phnom Penh Meckenbeuren | Central European Time | 05:00 |
| Phnom Penh Mebane | Eastern Time | 11:00 |
| Phnom Penh Meadville | Eastern Time | 11:00 |
| Phnom Penh Meaford | Eastern Time | 11:00 |
| Phnom Penh Mecheri | India Standard Time | 01:30 |
| Phnom Penh Mechanicsburg | Eastern Time | 11:00 |
| Phnom Penh Mallemort | Central European Time | 05:00 |
| Phnom Penh Malles Venosta | Central European Time | 05:00 |
| Phnom Penh Malmedy | Central European Time | 05:00 |
| Phnom Penh Malkishua | Eastern European Time | 04:00 |
| Phnom Penh Malinalco | Central Time | 12:00 |
| Phnom Penh Maliaño | Central European Time | 05:00 |
| Phnom Penh Malibu | Pacific Time | 14:00 |
| Phnom Penh Maldon | Eastern Australia Time | -03:00 |
| Phnom Penh Maleny | Eastern Australia Time | -03:00 |
| Phnom Penh Malton | United Kingdom Time | 06:00 |
| Phnom Penh Malvern | Eastern Time | 11:00 |
| Phnom Penh Malvern | Eastern Australia Time | -03:00 |