word | | Legal system |
| law | Marshall Islands | mixed legal system of US and English common law, customary law, and local statutes |
| law | Mauritania | mixed legal system of Islamic and French civil law |
| law | Mauritius | civil legal system based on French civil law with some elements of English common law |
| law | Mexico | civil law system with US constitutional law theory influence; judicial review of legislative acts |
| law | Micronesia, Federated States of | mixed legal system of common and customary law |
| law | Moldova | civil law system with Germanic law influences; Constitutional Court review of legislative acts |
| law | Monaco | civil law system influenced by French legal tradition |
| law | Mongolia | civil law system influenced by Soviet and Romano-Germanic legal systems; constitution ambiguous on judicial review of legislative acts |
| law | Montenegro | civil law |
| law | Montserrat | English common law |
| law | Morocco | mixed legal system of civil law based on French law and Islamic law; judicial review of legislative acts by Supreme Court |
| law | Mozambique | mixed legal system of Portuguese civil law, Islamic law, and customary law |
| law | Namibia | mixed legal system of uncodified civil law based on Roman-Dutch law and customary law |
| law | Nauru | mixed legal system of common law based on the English model and customary law |
| law | Nepal | English common law and Hindu legal concepts |