| Country | Legal system |
| Bahrain | based on Islamic law and English common law; has not accepted compulsory ICJ jurisdiction |
| Bangladesh | based on English common law; has not accepted compulsory ICJ jurisdiction |
| Barbados | English common law; no judicial review of legislative acts; accepts compulsory ICJ jurisdiction, with reservations |
| Belarus | based on civil law system; has not accepted compulsory ICJ jurisdiction |
| Belgium | based on civil law system influenced by English constitutional theory; judicial review of legislative acts; accepts compulsory ICJ jurisdiction, with reservations |
| Belize | English law; has not accepted compulsory ICJ jurisdiction |
| Benin | based on French civil law and customary law; has not accepted compulsory ICJ jurisdiction |
| Bermuda | English law |
| Bhutan | based on Indian law and English common law; has not accepted compulsory ICJ jurisdiction |
| Bolivia | based on Spanish law and Napoleonic Code; has not accepted compulsory ICJ jurisdiction |
| Bosnia and Herzegovina | based on civil law system; has not accepted compulsory ICJ jurisdiction |
| Botswana | based on Roman-Dutch law and local customary law; judicial review limited to matters of interpretation; accepts compulsory ICJ jurisdiction, with reservations |
| Bouvet Island | the laws of Norway, where applicable, apply |
| Brazil | based on Roman codes; has not accepted compulsory ICJ jurisdiction |
| British Indian Ocean Territory | the laws of the UK, where applicable, apply |
| British Virgin Islands | English law |
| Brunei | based on English common law; for Muslims, Islamic Shari'a law supersedes civil law in a number of areas; has not accepted compulsory ICJ jurisdiction |
| Bulgaria | civil and criminal law based on Roman law; accepts compulsory ICJ jurisdiction with reservations |
| Burkina Faso | based on French civil law system and customary law; has not accepted compulsory ICJ jurisdiction |
| Burma | based on English common law; has not accepted compulsory ICJ jurisdiction |
| Burundi | based on German and Belgian civil codes and customary law; has not accepted compulsory ICJ jurisdiction |
| Cambodia | primarily a civil law mixture of French-influenced codes from the United Nations Transitional Authority in Cambodia (UNTAC) period, royal decrees, and acts of the legislature, with influences of customary law and remnants of communist legal theory; increasing influence of common law; accepts compulsory ICJ jurisdiction with reservations |
| Cameroon | based on French civil law system, with common law influence; accepts compulsory ICJ jurisdiction |
| Canada | based on English common law, except in Quebec, where civil law system based on French law prevails; accepts compulsory ICJ jurisdiction, with reservations |
| Cape Verde | based on the legal system of Portugal; has not accepted compulsory ICJ jurisdiction |
| Cayman Islands | British common law and local statutes |
| Central African Republic | based on French law; has not accepted compulsory ICJ jurisdiction |
| Chad | based on French civil law system and Chadian customary law; has not accepted compulsory ICJ jurisdiction |