| Country | Legal system |
| Greece | based on codified Roman law; judiciary divided into civil, criminal, and administrative courts; accepts compulsory ICJ jurisdiction with reservations |
| Greenland | the laws of Denmark, where applicable, apply |
| Grenada | based on English common law; has not accepted compulsory ICJ jurisdiction |
| Guam | modeled on US; US federal laws apply |
| Guatemala | civil law system; judicial review of legislative acts; has not accepted compulsory ICJ jurisdiction |
| Guernsey | the laws of the UK, where applicable, apply; justice is administered by the Royal Court |
| Guinea | based on French civil law system, customary law, and decree; accepts compulsory ICJ jurisdiction with reservations |
| Guinea-Bissau | based on French civil law; accepts compulsory ICJ jurisdiction |
| Guyana | based on English common law with certain admixtures of Roman-Dutch law; has not accepted compulsory ICJ jurisdiction |
| Haiti | based on Roman civil law system; accepts compulsory ICJ jurisdiction |
| Heard Island and McDonald Islands | the laws of Australia, where applicable, apply |
| Holy See (Vatican City) | based on Code of Canon Law and revisions to it |
| Honduras | rooted in Roman and Spanish civil law with increasing influence of English common law; recent judicial reforms include abandoning Napoleonic legal codes in favor of the oral adversarial system; accepts ICJ jurisdiction with reservations |
| Hong Kong | based on English common law |
| Hungary | based on the German-Austrian legal system; accepts compulsory ICJ jurisdiction with reservations |
| Iceland | civil law system based on Danish law; has not accepted compulsory ICJ jurisdiction |