| Country | Constitution |
| Luxembourg | 17 October 1868; occasional revisions |
| Macau | Basic Law, approved on 31 March 1993 by China's National People's Congress, is Macau's "mini-constitution" |
| Macedonia | adopted 17 November 1991, effective 20 November 1991; amended November 2001 by a series of new constitutional amendments strengthening minority rights and in 2005 with amendments related to the judiciary |
| Madagascar | 19 August 1992 by national referendum |
| Malawi | 18 May 1994 |
| Malaysia | 31 August 1957 (amended many times, latest in 2007) |
| Maldives | adopted 1 January 1998 |
| Mali | adopted 12 January 1992 |
| Malta | 1964 constitution; amended many times |
| Marshall Islands | 1 May 1979 |
| Mauritania | 12 July 1991 |
| Mauritius | 12 March 1968; amended 12 March 1992 |
| Mayotte | 4 October 1958 (French Constitution) |
| Mexico | 5 February 1917 |
| Micronesia, Federated States of | 10 May 1979 |
| Moldova | new constitution adopted 29 July 1994, effective 27 August 1994; replaced old Soviet constitution of 1979 |
| Monaco | 17 December 1962 |
| Mongolia | 12 February 1992 |
| Montenegro | 19 October 2007 (was approved by the Assembly) |
| Montserrat | effective 19 December 1989 |
| Morocco | 10 March 1972; revised 4 September 1992, amended (to create bicameral legislature) September 1996 |
| Mozambique | 30 November 1990 |
| Namibia | ratified 9 February 1990, effective 12 March 1990 |
| Nauru | 29 January 1968; amended 17 May 1968 (Constitution Day) |
| Navassa Island | void |
| Nepal | 9 November 1990; note - a new interim constitution was promulgated in January 2007; the November 2006 peace agreement calls for the election of a constituent assembly to draft a new permanent constitution |
| Netherlands | adopted 1815; amended many times, most recently in 2002 |
| Netherlands Antilles | 29 December 1954, Statute of the Realm of the Netherlands, as amended |
| New Caledonia | 4 October 1958 (French Constitution) |
| New Zealand | consists of a series of legal documents, including certain acts of the UK and New Zealand Parliaments, as well as The Constitution Act 1986, which is the principal formal charter; adopted 1 January 1987, effective 1 January 1987 |
| Nicaragua | 9 January 1987; reforms in 1995, 2000, and 2005 |
| Niger | new constitution adopted 18 July 1999 |
| Nigeria | new constitution adopted 5 May 1999; effective 29 May 1999 |
| Niue | 19 October 1974 (Niue Constitution Act) |
| Norfolk Island | Norfolk Island Act of 1979, as amended in 2005 |
| Northern Mariana Islands | Constitution of the Commonwealth of the Northern Mariana Islands effective 1 January 1978; Covenant Agreement fully effective 4 November 1986 |
| Norway | 17 May 1814; amended many times |
| Oman | none; note - on 6 November 1996, Sultan QABOOS issued a royal decree promulgating a basic law considered by the government to be a constitution which, among other things, clarifies the royal succession, provides for a prime minister, bars ministers from holding interests in companies doing business with the government, establishes a bicameral legislature, and guarantees basic civil liberties for Omani citizens |
| Pacific Ocean | void |
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