word | | Constitution |
| number | Lebanon | 23 May 1926; amended a number of times, most recently Charter of Lebanese National Reconciliation (Ta'if Accord) of October 1989 |
| observers | Kyrgyzstan | ... were annulled in September 2007, and a new version was approved by referendum on 21 October 2007; the BAKIEV-initiated referendum was criticized by Western observers for voting irregularities, particularly ballot stuffing |
| observing | Haiti | ... in a military coup in September 1991, although in October 1991, military government claimed to be observing the constitution; returned to constitutional rule in October 1994; constitution, while technically in force between ... |
| occasional | Luxembourg | 17 October 1868; occasional revisions |
| October | Belarus | 15 March 1994; revised by national referendum of 24 November 1996 giving the presidency greatly expanded powers and became effective 27 November 1996; revised again 17 October 2004 removing presidential term limits |
| October | Brazil | 5 October 1988 |
| October | Christmas Island | Christmas Island Act of 1958-59 (1 October 1958) as amended by the Territories Law Reform Act of 1992 |
| October | European Union | ... and the Treaty of Nice in 2003; note - a new draft Constitutional Treaty, signed on 29 October 2004 in Rome, gave member states two years for ratification either by parliamentary vote or ... |
| October | Falkland Islands (Islas Malvinas) | 3 October 1985; amended 1997 and 1998 |
| October | France | adopted by referendum 28 September 1958, effective 4 October 1958 note: amended concerning election of president in 1962; amended to comply with provisions of 1992 EC Maastricht Treaty, 1997 Amsterdam Treaty, 2003 ... |
| October | French Polynesia | 4 October 1958 (French Constitution) |
| October | Germany | 23 May 1949, known as Basic Law; became constitution of the united Germany 3 October 1990 |
| October | Guyana | 6 October 1980 |
| October | Haiti | ... articles reinstated March 1989; constitutional government ousted in a military coup in September 1991, although in October 1991, military government claimed to be observing the constitution; returned to constitutional rule in October ... |
| October | Hungary | 18 August 1949, effective 20 August 1949; revised 19 April 1972; 18 October 1989 revision ensured legal rights for individuals and constitutional checks on the authority of the prime minister and also ... |
| October | Iraq | ratified on 15 October 2005 (subject to review by the Constitutional Review Committee and a possible public referendum ) |
| October | Korea, South | 17 July 1948; note - amended or rewritten nine times; current constitution approved on 29 October 1987 |
| October | Kyrgyzstan | ... versions were annulled in September 2007, and a new version was approved by referendum on 21 October 2007; the BAKIEV-initiated referendum was criticized by Western observers for voting irregularities, particularly ballot ... |
| October | Lebanon | 23 May 1926; amended a number of times, most recently Charter of Lebanese National Reconciliation (Ta'if Accord) of October 1989 |
| October | Liechtenstein | 5 October 1921 |
| October | Lithuania | adopted 25 October 1992 |
| October | Luxembourg | 17 October 1868; occasional revisions |
| October | Mayotte | 4 October 1958 (French Constitution) |
| October | Montenegro | 19 October 2007 (approved by the Assembly) |
| October | New Caledonia | 4 October 1958 (French Constitution) |
| October | Niue | 19 October 1974 (Niue Constitution Act) |
| October | Pakistan | 12 April 1973; suspended 5 July 1977, restored 30 December 1985; suspended 15 October 1999, restored in stages in 2002; amended 31 December 2003; suspended 3 November 2007; restored on 15 December ... |