word | | Constitution |
| December | Bosnia and Herzegovina | the Dayton Peace Accords, signed 14 December 1995 in Paris, included a constitution; note - each of the entities also has its own constitution |
| December | Brunei | 29 September 1959 (some provisions suspended under a State of Emergency since December 1962, others since independence on 1 January 1984) |
| December | Central African Republic | ratified by popular referendum 5 December 2004; effective 27 December 2004 |
| December | China | most recent promulgation 4 December 1982; amended several times |
| December | Comoros | 23 December 2001 |
| December | Croatia | adopted 22 December 1990; revised 2000, 2001 |
| December | Cyprus | 16 August 1960 note: from December 1963, the Turkish Cypriots no longer participated in the government; negotiations to create the basis for a new or revised constitution to govern the island and ... |
| December | Czech Republic | ratified 16 December 1992, effective 1 January 1993; amended several times |
| December | El Salvador | 20 December 1983 |
| December | Ethiopia | ratified 8 December 1994, effective 22 August 1995 |
| December | Grenada | 19 December 1973 |
| December | Iran | 2-3 December 1979; revised 1989 note: the revision in 1989 expanded powers of the presidency and eliminated the prime ministership |
| December | Ireland | adopted 1 July 1937 by plebiscite; effective 29 December 1937 |
| December | Italy | passed 11 December 1947, effective 1 January 1948; amended many times |
| December | Libya | ... 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 ... |