word | | Legal system |
| compulsory | Uganda | in 1995, the government restored the legal system to one based on English common law and customary law; accepts compulsory ICJ jurisdiction with reservations |
| compulsory | Ukraine | based on civil law system; judicial review of legislative acts; has not accepted compulsory ICJ jurisdiction |
| compulsory | United Arab Emirates | based on a dual system of Sharia and civil courts; has not accepted compulsory ICJ jurisdiction |
| compulsory | United Kingdom | ... on common law tradition with early Roman and modern continental influences; has nonbinding judicial review of Acts of Parliament under the Human Rights Act of 1998; accepts compulsory ICJ jurisdiction with reservations |
| compulsory | United States | ... system, of which all but one (Louisiana, which is still influenced by the Napoleonic Code) is based on English common law; judicial review of legislative acts; has not accepted compulsory ICJ jurisdiction |
| compulsory | Uruguay | based on Spanish civil law system; accepts compulsory ICJ jurisdiction |
| compulsory | Uzbekistan | based on civil law system; has not accepted compulsory ICJ jurisdiction |
| compulsory | Vanuatu | unified system being created from former dual French and British systems; has not accepted compulsory ICJ jurisdiction |
| compulsory | Venezuela | open, adversarial court system; has not accepted compulsory ICJ jurisdiction |
| compulsory | Vietnam | based on communist legal theory and French civil law system; has not accepted compulsory ICJ jurisdiction |
| compulsory | Yemen | based on Islamic law, Turkish law, English common law, and local tribal customary law; has not accepted compulsory ICJ jurisdiction |
| compulsory | Zambia | based on English common law and customary law; judicial review of legislative acts in an ad hoc constitutional council; has not accepted compulsory ICJ jurisdiction |
| compulsory | Zimbabwe | mixture of Roman-Dutch and English common law; has not accepted compulsory ICJ jurisdiction |