| Country | Country name |
| Latvia | conventional long form: Republic of Latvia conventional short form: Latvia local long form: Latvijas Republika local short form: Latvija former: Latvian Soviet Socialist Republic |
| Lebanon | conventional long form: Lebanese Republic conventional short form: Lebanon local long form: Al Jumhuriyah al Lubnaniyah local short form: Lubnan former: Greater Lebanon |
| Lesotho | conventional long form: Kingdom of Lesotho conventional short form: Lesotho local long form: Kingdom of Lesotho local short form: Lesotho former: Basutoland |
| Liberia | conventional long form: Republic of Liberia conventional short form: Liberia |
| Libya | conventional long form: Great Socialist People's Libyan Arab Jamahiriya conventional short form: Libya local long form: Al Jumahiriyah al Arabiyah al Libiyah ash Shabiyah al Ishtirakiyah al Uzma local short form: none |
| Liechtenstein | conventional long form: Principality of Liechtenstein conventional short form: Liechtenstein local long form: Fuerstentum Liechtenstein local short form: Liechtenstein |
| Lithuania | conventional long form: Republic of Lithuania conventional short form: Lithuania local long form: Lietuvos Respublika local short form: Lietuva former: Lithuanian Soviet Socialist Republic |
| Luxembourg | conventional long form: Grand Duchy of Luxembourg conventional short form: Luxembourg local long form: Grand Duche de Luxembourg local short form: Luxembourg |
| Macau | conventional long form: Macau Special Administrative Region conventional short form: Macau local long form: Aomen Tebie Xingzhengqu (Chinese); Regiao Administrativa Especial de Macau (Portuguese) local short form: Aomen (Chinese); Macau (Portuguese) |
| Macedonia | conventional long form: Republic of Macedonia conventional short form: Macedonia local long form: Republika Makedonija local short form: Makedonija note: the provisional designation used by the UN, EU, and NATO is the Former Yugoslav Republic of Macedonia (FYROM) former: People's Republic of Macedonia, Socialist Republic of Macedonia |
| Madagascar | conventional long form: Republic of Madagascar conventional short form: Madagascar local long form: Republique de Madagascar/Repoblikan'i Madagasikara local short form: Madagascar/Madagasikara former: Malagasy Republic |
| Malawi | conventional long form: Republic of Malawi conventional short form: Malawi local long form: Dziko la Malawi local short form: Malawi former: British Central African Protectorate, Nyasaland Protectorate, Nyasaland |
| Malaysia | conventional long form: none conventional short form: Malaysia local long form: none local short form: Malaysia former: Federation of Malaya |
| Maldives | conventional long form: Republic of Maldives conventional short form: Maldives local long form: Dhivehi Raajjeyge Jumhooriyyaa local short form: Dhivehi Raajje |
| Mali | conventional long form: Republic of Mali conventional short form: Mali local long form: Republique de Mali local short form: Mali former: French Sudan and Sudanese Republic |
| Malta | conventional long form: Republic of Malta conventional short form: Malta local long form: Repubblika ta' Malta local short form: Malta |
| Marshall Islands | conventional long form: Republic of the Marshall Islands conventional short form: Marshall Islands local long form: Republic of the Marshall Islands local short form: Marshall Islands abbreviation: RMI former: Trust Territory of the Pacific Islands, Marshall Islands District |
| Mauritania | conventional long form: Islamic Republic of Mauritania conventional short form: Mauritania local long form: Al Jumhuriyah al Islamiyah al Muritaniyah local short form: Muritaniyah |
| Mauritius | conventional long form: Republic of Mauritius conventional short form: Mauritius local long form: Republic of Mauritius local short form: Mauritius |
| Mayotte | conventional long form: Territorial Collectivity of Mayotte conventional short form: Mayotte |
| Mexico | conventional long form: United Mexican States conventional short form: Mexico local long form: Estados Unidos Mexicanos local short form: Mexico |
| Micronesia, Federated States of | conventional long form: Federated States of Micronesia conventional short form: none local long form: Federated States of Micronesia local short form: none former: Trust Territory of the Pacific Islands, Ponape, Truk, and Yap Districts abbreviation: FSM |
| Moldova | conventional long form: Republic of Moldova conventional short form: Moldova local long form: Republica Moldova local short form: Moldova former: Moldavian Soviet Socialist Republic, Moldovan Soviet Socialist Republic |
| Monaco | conventional long form: Principality of Monaco conventional short form: Monaco local long form: Principaute de Monaco local short form: Monaco |