word | | Constitution |
| 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 | Iraq | ratified 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 many times; current constitution approved 29 October 1987 |
| October | Lebanon | 23 May 1926; amended a number of times, most recently in 1990 to include changes necessitated by the Charter of Lebanese National Reconciliation (Ta'if Accord) of October 1989 |
| October | Liechtenstein | 5 October 1921; amended 15 September 2003 |
| October | Lithuania | adopted 25 October 1992; last amended 13 July 2004 |
| October | Luxembourg | 17 October 1868; occasional revisions |
| October | Mayotte | 4 October 1958 (French Constitution) |
| October | Montenegro | approved 19 October 2007 (by the Assembly) |
| October | New Caledonia | 4 October 1958 (French Constitution) |
| October | Niger | adopted 31 October 2010 |
| October | Niue | 19 October 1974 (Niue Constitution Act) |