| Udon Thani Maylands | Western Australia Time | -01:00 |
| Udon Thani Mayotte | Eastern Time | 11:00 |
| Udon Thani Mayville | Eastern Time | 11:00 |
| Udon Thani Mavivi | Central Africa Time | 05:00 |
| Udon Thani Mawgan | United Kingdom Time | 06:00 |
| Udon Thani Mawson Lakes | Central Australia Time | -02:30 |
| Udon Thani Maxey | United Kingdom Time | 06:00 |
| Udon Thani Maumee | Eastern Time | 11:00 |
| Udon Thani Maude | Eastern Australia Time | -03:00 |
| Udon Thani Matten bei Interlaken | Central European Time | 05:00 |
| Udon Thani Matraville | Eastern Australia Time | -03:00 |
| Udon Thani Moka | Mauritius Time | 03:00 |
| Udon Thani Mokpo-si | Korean Time | -02:00 |
| Udon Thani Mollerussa | Central European Time | 05:00 |
| Udon Thani Mollis | Central European Time | 05:00 |
| Udon Thani Mollem | India Standard Time | 01:30 |
| Udon Thani Mönchengladbach | Central European Time | 05:00 |
| Udon Thani Monchique | Western European Time | 06:00 |
| Udon Thani Monastero Bormida | Central European Time | 05:00 |
| Udon Thani Monastier di Treviso | Central European Time | 05:00 |
| Udon Thani Moniga del Garda | Central European Time | 05:00 |
| Udon Thani Monguelfo-Tesido | Central European Time | 05:00 |
| Udon Thani Montana | Central European Time | 05:00 |
| Udon Thani Montanara | Central European Time | 05:00 |
| Udon Thani Montblanc | Central European Time | 05:00 |
| Udon Thani Montauk | Eastern Time | 11:00 |
| Udon Thani Mont-Tremblant | Eastern Time | 11:00 |
| Udon Thani Montague | Eastern Time | 11:00 |
| Udon Thani Montague | Atlantic Time | 10:00 |
| Udon Thani Mont Albert | Eastern Australia Time | -03:00 |
| Udon Thani Monreal del Campo | Central European Time | 05:00 |
| Udon Thani Monona | Central Time | 12:00 |
| Udon Thani Monkton | Eastern Time | 11:00 |
| Udon Thani Monmouth | Central Time | 12:00 |
| Udon Thani Monroe Township | Eastern Time | 11:00 |
| Udon Thani Náměšť nad Oslavou | Central European Time | 05:00 |
| Udon Thani Namur | Central European Time | 05:00 |
| Udon Thani Nala Sopara | India Standard Time | 01:30 |