word | | Country name |
| short | Mauritania | conventional long form: Islamic Republic of Mauritania conventional short form: Mauritania local long form: Al Jumhuriyah al Islamiyah al Muritaniyah local short form: Muritaniyah |
| short | Mauritius | conventional long form: Republic of Mauritius conventional short form: Mauritius local long form: Republic of Mauritius local short form: Mauritius |
| short | Mayotte | conventional long form: Territorial Collectivity of Mayotte conventional short form: Mayotte |
| short | Mexico | conventional long form: United Mexican States conventional short form: Mexico local long form: Estados Unidos Mexicanos local short form: Mexico |
| short | Micronesia, Federated States of | conventional long form: Federated States of Micronesia conventional short form: none local long form: Federated States of Micronesia local short form: none former: Trust Territory of the Pacific Islands, Ponape, Truk, and ... |
| short | Moldova | conventional long form: Republic of Moldova conventional short form: Moldova local long form: Republica Moldova local short form: Moldova former: Moldavian Soviet Socialist Republic, Moldovan Soviet Socialist Republic |
| short | Monaco | conventional long form: Principality of Monaco conventional short form: Monaco local long form: Principaute de Monaco local short form: Monaco |
| short | Mongolia | conventional long form: none conventional short form: Mongolia local long form: none local short form: Mongol Uls former: Outer Mongolia |
| short | Montenegro | conventional long form: none conventional short form: Montenegro local long form: none local short form: Crna Gora former: People's Republic of Montenegro, Socialist Republic of Montenegro, Republic of Montenegro |
| short | Montserrat | conventional long form: none conventional short form: Montserrat |
| short | Morocco | conventional long form: Kingdom of Morocco conventional short form: Morocco local long form: Al Mamlakah al Maghribiyah local short form: Al Maghrib |
| short | Mozambique | conventional long form: Republic of Mozambique conventional short form: Mozambique local long form: Republica de Mocambique local short form: Mocambique former: Portuguese East Africa |
| short | Namibia | conventional long form: Republic of Namibia conventional short form: Namibia local long form: Republic of Namibia local short form: Namibia former: German Southwest Africa, South-West Africa |
| short | Nauru | conventional long form: Republic of Nauru conventional short form: Nauru local long form: Republic of Nauru local short form: Nauru former: Pleasant Island |
| short | Navassa Island | conventional long form: none conventional short form: Navassa Island |
| short | Nepal | conventional long and short form: Nepal local long and short form: Nepal |
| short | Netherlands | conventional long form: Kingdom of the Netherlands conventional short form: Netherlands local long form: Koninkrijk der Nederlanden local short form: Nederland |
| short | Netherlands Antilles | conventional long form: none conventional short form: Netherlands Antilles local long form: none local short form: Nederlandse Antillen former: Curacao and Dependencies |
| short | New Caledonia | conventional long form: Territory of New Caledonia and Dependencies conventional short form: New Caledonia local long form: Territoire des Nouvelle-Caledonie et Dependances local short form: Nouvelle-Caledonie |
| short | New Zealand | conventional long form: none conventional short form: New Zealand abbreviation: NZ |
| short | Nicaragua | conventional long form: Republic of Nicaragua conventional short form: Nicaragua local long form: Republica de Nicaragua local short form: Nicaragua |
| short | Niger | conventional long form: Republic of Niger conventional short form: Niger local long form: Republique du Niger local short form: Niger |
| short | Nigeria | conventional long form: Federal Republic of Nigeria conventional short form: Nigeria |