word | | Constitution |
| December | Madagascar | passed by referendum 17 November 2010; promulgated 11 December 2010 (2010) |
| December | Monaco | 17 December 1962; modified 2 April 2002 |
| 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 15 December 2007 ... |
| 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 4 December 1996; was signed by then President MANDELA 10 December 1996; and entered into effect 4 February 1997 |
| December | Spain | approved by legislature 31 October 1978; passed by referendum 6 December 1978; signed by the king 27 December 1978 |
| December | Sri Lanka | adopted 16 August 1978, certified 31 August 1978; amended 20 December 2001 |
| December | Switzerland | revision of Constitution of 1874 approved by the Federal Parliament 18 December 1998, adopted by referendum 18 April 1999, officially entered into force 1 January 2000 |
| December | Taiwan | adopted 25 December 1946; promulgated 1 January 1947; effective 25 December 1947; amended many times |
| December | United Arab Emirates | 2 December 1971; made permanent in 1996 |
| December | Uzbekistan | adopted 8 December 1992 |
| December | Venezuela | 30 December 1999 |
| December | Zimbabwe | 21 December 1979 |