| Country | Legal system |
| Micronesia, Federated States of | based on adapted Trust Territory laws, acts of the legislature, municipal, common, and customary laws; has not accepted compulsory ICJ jurisdiction |
| Midway Islands | void |
| Moldova | based on civil law system; Constitutional Court reviews legality of legislative acts and governmental decisions of resolution; accepts many UN and Organization for Security and Cooperation in Europe (OSCE) documents; has not accepted compulsory ICJ jurisdiction |
| Monaco | based on French law; has not accepted compulsory ICJ jurisdiction |
| Mongolia | blend of Soviet, German, and US systems that combine "continental" or "civil" code and case-precedent; constitution ambiguous on judicial review of legislative acts; has not accepted compulsory ICJ jurisdiction |
| Montenegro | based on civil law system; has not accepted compulsory ICJ jurisdiction |
| Montserrat | English common law and statutory law |
| Morocco | based on Islamic law and French and Spanish civil law systems; judicial review of legislative acts in Constitutional Chamber of Supreme Court; has not accepted compulsory ICJ jurisdiction |
| Mozambique | based on Portuguese civil law system and customary law; has not accepted compulsory ICJ jurisdiction |
| Namibia | based on Roman-Dutch law and 1990 constitution; has not accepted compulsory ICJ jurisdiction |
| Nauru | acts of the Nauru Parliament and British common law; accepts compulsory ICJ jurisdiction with reservations |
| Navassa Island | the laws of the US, where applicable, apply |
| Nepal | based on Hindu legal concepts and English common law; has not accepted compulsory ICJ jurisdiction |
| Netherlands | based on civil law system incorporating French penal theory; constitution does not permit judicial review of acts of the States General; accepts compulsory ICJ jurisdiction with reservations |
| Netherlands Antilles | based on Dutch civil law system with some English common law influence |
| New Caledonia | based on French civil law; the 1988 Matignon Accords grant substantial autonomy to the islands |
| New Zealand | based on English law, with special land legislation and land courts for the Maori; accepts compulsory ICJ jurisdiction with reservations |
| Nicaragua | civil law system; Supreme Court may review administrative acts; accepts compulsory ICJ jurisdiction |
| Niger | based on French civil law system and customary law; has not accepted compulsory ICJ jurisdiction |
| Nigeria | based on English common law, Islamic law (in 12 northern states), and traditional law; accepts compulsory ICJ jurisdiction with reservations |
| Niue | English common law; note - Niue is self-governing, with the power to make its own laws |
| Norfolk Island | based on the laws of Australia, local ordinances and acts; English common law applies in matters not covered by either Australian or Norfolk Island law |
| Northern Mariana Islands | based on US system, except for customs, wages, immigration laws, and taxation |
| Norway | mixture of customary law, civil law system, and common law traditions; Supreme Court renders advisory opinions to legislature when asked; accepts compulsory ICJ jurisdiction with reservations |
| Oman | based on English common law and Islamic law; ultimate appeal to the monarch; has not accepted compulsory ICJ jurisdiction |
| Pacific Ocean | void |
| Pakistan | based on English common law with provisions to accommodate Pakistan's status as an Islamic state; accepts compulsory ICJ jurisdiction with reservations |
| Palau | based on Trust Territory laws, acts of the legislature, municipal, common, and customary laws; has not accepted compulsory ICJ jurisdiction |
| Palmyra Atoll | void |