| Country | Country name |
| Namibia | conventional long form: Republic of Namibia conventional short form: Namibia local long form: Republic of Namibia local short form: Namibia former: German South-West Africa (Sued-West Afrika), South-West Africa |
| Nauru | conventional long form: Republic of Nauru conventional short form: Nauru local long form: Republic of Nauru local short form: Nauru former: Pleasant Island |
| Navassa Island | conventional long form: none conventional short form: Navassa Island |
| Nepal | conventional long form: Federal Democratic Republic of Nepal conventional short form: Nepal local long form: Sanghiya Loktantrik Ganatantra Nepal local short form: Nepal |
| Netherlands | conventional long form: Kingdom of the Netherlands conventional short form: Netherlands local long form: Koninkrijk der Nederlanden local short form: Nederland |
| 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 |
| New Zealand | conventional long form: none conventional short form: New Zealand abbreviation: NZ |
| Nicaragua | conventional long form: Republic of Nicaragua conventional short form: Nicaragua local long form: Republica de Nicaragua local short form: Nicaragua |
| Niger | conventional long form: Republic of Niger conventional short form: Niger local long form: Republique du Niger local short form: Niger |
| Nigeria | conventional long form: Federal Republic of Nigeria conventional short form: Nigeria |
| Niue | conventional long form: none conventional short form: Niue note: pronunciation falls between nyu-way and new-way, but not like new-wee former: Savage Island |
| Norfolk Island | conventional long form: Territory of Norfolk Island conventional short form: Norfolk Island |
| Northern Mariana Islands | conventional long form: Commonwealth of the Northern Mariana Islands conventional short form: Northern Mariana Islands abbreviation: CNMI former: Trust Territory of the Pacific Islands, Mariana Islands District |
| Norway | conventional long form: Kingdom of Norway conventional short form: Norway local long form: Kongeriket Norge local short form: Norge |