| Country | Legal system |
| Ukraine | civil law system; judicial review of legislative acts |
| United Arab Emirates | mixed legal system of Islamic law and civil law |
| United Kingdom | common law system; has nonbinding judicial review of Acts of Parliament under the Human Rights Act of 1998 |
| United States | common law system based on English common law at the federal level; state legal systems based on common law except Louisiana, which is based on Napoleonic civil code; judicial review of legislative acts |
| United States Pacific Island Wildlife Refuges | the laws of the US where applicable apply |
| Uruguay | civil law system based on the Spanish civil code |
| Uzbekistan | civil law system |
| Vanuatu | mixed legal system of English common law, French law, and customary law |
| Venezuela | civil law system based on the Spanish civil code |
| Vietnam | civil law system; note - the civil code of 2005 reflects a European style civil law |
| Virgin Islands | US common law |
| Wake Island | US common law |
| Wallis and Futuna | French civil law |
| West Bank | void |
| Western Sahara | void |
| World | the legal systems of nearly all countries are generally modeled upon elements of five main types: civil law (including French law, the Napoleonic Code, Roman law, Roman-Dutch law, and Spanish law); common law (including United States law); customary law; mixed or pluralistic law; and religious law (including Islamic law); an additional type of legal system - international law - governs the conduct of independent nations in their relationships with one another |
| Yemen | mixed legal system of Islamic law, English common law, and customary law |
| Zambia | mixed legal system of English common law and customary law; judicial review of legislative acts in an ad hoc constitutional council |
| Zimbabwe | mixed legal system of English common law, Roman-Dutch civil law, and customary law |