| Country | Constitution |
| Lesotho | 2 April 1993 |
| Liberia | 6 January 1986 |
| Libya | note - following the September 1969 military overthrow of the Libyan government, the Revolutionary Command Council replaced the existing constitution with the Constitutional Proclamation in December 1969; in March 1977, Libya adopted the Declaration of the Establishment of the People's Authority; note - the Transitional National Council, recognized by the UN in September 2011 as the legitimate interim government, operates under a temporary constitution |
| Liechtenstein | 5 October 1921; amended 15 September 2003 |
| Lithuania | adopted 25 October 1992; last amended 13 July 2004 |
| Luxembourg | 17 October 1868; occasional revisions |
| Macau | The Basic Law, approved 31 March 1993 by China's National People's Congress, is Macau's charter |
| Macedonia | adopted 17 November 1991, effective 20 November 1991; amended November 2001, 2005 and in 2009 note: amended November 2001 by a series of new constitutional amendments strengthening minority rights, in 2005 with amendments related to the judiciary, and in 2009 with amendments related to the threshold required to elect the president |
| Madagascar | passed by referendum 17 November 2010; promulgated 11 December 2010 (2010) |
| Malawi | 18 May 1994 |
| Malaysia | 31 August 1957; amended many times the latest in 2007 |
| Maldives | new constitution ratified 7 August 2008 |
| Mali | adopted 12 January 1992 |
| Malta | 1964; 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 | adopted 29 July 1994; effective 27 August 1994; note - replaced 1979 Soviet constitution |