word | | Constitution |
| 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 ... |
| December | Monaco | 17 December 1962; modified 2 April 2002 |
| December | Montserrat | effective 19 December 1989 |
| December | Netherlands Antilles | 29 December 1954, Statute of the Realm of the Netherlands, as amended |
| December | 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 ... |
| December | Peru | 29 December 1993 |
| December | Romania | 8 December 1991; revised 29 October 2003 |
| December | Russia | adopted 12 December 1993 |
| December | Slovenia | adopted 23 December 1991, amended 14 July 1997 and 25 July 2000 |
| December | South Africa | 10 December 1996; note - certified by the Constitutional Court on 4 December 1996; was signed by then President MANDELA on 10 December 1996; and entered into effect on 4 February 1997 |
| December | Spain | approved by legislature 31 October 1978; passed by referendum 6 December 1978; effective 29 December 1978 |
| December | Sri Lanka | adopted 16 August 1978, certified 31 August 1978; amended 20 December 2000 |
| December | Sudan | Interim National Constitution ratified 5 July 2005 note: under the Comprehensive Peace Agreement, the Interim National Constitution was ratified 5 July 2005; Constitution of Southern Sudan was signed December 2005 |