| Country | Legal system |
| Paracel Islands | void |
| Paraguay | civil law system with influences from Argentine, Spanish, Roman, and French civil law models; judicial review of legislative acts in Supreme Court of Justice |
| Peru | civil law system |
| Philippines | mixed legal system of civil, common, Islamic, and customary law |
| Pitcairn Islands | local island by-laws |
| Poland | civil law system; changes gradually being introduced as part of broader democratization process; limited judicial review of legislative acts, but rulings of the Constitutional Tribunal are final |
| Portugal | civil law system; Constitutional Tribunal review of legislative acts |
| Puerto Rico | civil law system based on the Spanish civil code and within the framework of the US federal system |
| Qatar | mixed legal system of civil law and Islamic law (in family and personal matters) |
| Romania | civil law system |
| Russia | civil law system; judicial review of legislative acts |
| Rwanda | mixed legal system of civil law, based on German and Belgian models, and customary law; judicial review of legislative acts in the Supreme Court |
| Saint Barthelemy | French civil law |
| Saint Helena | English common law and local statutes |
| Saint Kitts and Nevis | English common law |
| Saint Lucia | English common law |
| Saint Martin | French civil law |
| Saint Pierre and Miquelon | French civil law |
| Saint Vincent and the Grenadines | English common law |
| Samoa | mixed legal system of English common law and customary law; judicial review of legislative acts with respect to fundamental rights of the citizen |
| San Marino | civil law system with Italian civil law influences |
| Sao Tome and Principe | mixed legal system of civil law base on the Portuguese model and customary law |