| Country | Constitution |
| Monaco | 17 December 1962; modified 2 April 2002 |
| Mongolia | 13 January 1992 |
| Montenegro | approved 19 October 2007 (by the Assembly) |
| Montserrat | Montserrat Constitution Order 2010, effective 1 September 2011 |
| Morocco | 10 March 1972; revised 4 September 1992, amended September 1996; new constitution approved in referendum 1 July 2011 |
| Mozambique | 30 November 1990 |
| Namibia | ratified 9 February 1990, effective 12 March 1990 |
| Nauru | 29 January 1968; amended 17 May 1968 |
| Navassa Island | void |
| Nepal | 15 January 2007 (interim Constitution); note - in April 2008, a Constituent Assembly was elected to draft and promulgate a new constitution by May 2010; the fourth and final deadline extended to May 2012 |
| Netherlands | adopted 1815; amended many times, most recently in 2002 |
| 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; revised in 1995, 2000, and 2005 |
| Niger | adopted 31 October 2010 |
| Nigeria | 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 |
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