| Country | Legal system |
| 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; the 2009 Constitution incorporates indigenous community justice into Bolivia's judicial system |
| 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 Sharia law supersedes civil law in a number of areas; has not accepted compulsory ICJ jurisdiction |