| Country | Constitution |
| Afghanistan | new constitution drafted 14 December 2003-4 January 2004; signed 16 January 2004 |
| Akrotiri | Sovereign Base Areas of Akrotiri and Dhekelia Order in Council 1960, effective 16 August 1960, functions as a basic legal document |
| Albania | adopted by popular referendum on 22 November 1998; promulgated 28 November 1998 |
| Algeria | 8 September 1963; revised 19 November 1976, effective 22 November 1976; revised 3 November 1988, 23 February 1989, and 28 November 1996 |
| American Samoa | ratified 2 June 1966, effective 1 July 1967 |
| Andorra | Andorra's first written constitution was drafted in 1991, approved by referendum 14 March 1993, effective 28 April 1993 |
| Angola | adopted by People's Assembly 25 August 1992 |
| Anguilla | Anguilla Constitutional Order 1 April 1982; amended 1990 |
| Antarctica | void |
| Antigua and Barbuda | 1 November 1981 |
| Arctic Ocean | void |
| Argentina | 1 May 1853; amended many times starting in 1860 |
| Armenia | adopted by nationwide referendum 5 July 1995; amendments adopted through a nationwide referendum 27 November 2005 |
| Aruba | 1 January 1986 |
| Ashmore and Cartier Islands | void |
| Atlantic Ocean | void |
| Australia | 9 July 1900, effective 1 January 1901 |
| Austria | 1920; revised 1929; reinstated 1 May 1945; note - during the period 1 May 1934-1 May 1945 there was a fascist (corporative) constitution in place |
| Azerbaijan | adopted 12 November 1995 |
| Bahamas, The | 10 July 1973 |
| Bahrain | adopted 14 February 2002 |
| Bangladesh | 4 November 1972, effective 16 December 1972; suspended following coup of 24 March 1982, restored 10 November 1986; amended many times |
| Barbados | 30 November 1966 |
| 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 |
| Belgium | 7 February 1831; amended many times; revised 14 July 1993 to create a federal state |
| Belize | 21 September 1981 |
| Benin | adopted by referendum 2 December 1990 |
| Bermuda | 8 June 1968; amended 1989 and 2003 |
| Bhutan | none; note - a draft constitution was unveiled in March 2005 and is expected to be adopted following the election of a new National Assembly in 2008 |
| Bolivia | 2 February 1967; revised in August 1994; possible referendum on new constitution to be held in 2008 |
| Bosnia and Herzegovina | the Dayton Agreement, signed 14 December 1995 in Paris, included a new constitution now in force; note - each of the entities also has its own constitution |
| Botswana | March 1965, effective 30 September 1966 |
| Bouvet Island | void |
| Brazil | 5 October 1988 |
| British Indian Ocean Territory | void |
| British Virgin Islands | 13 June 2007 |
| Brunei | 29 September 1959 (some provisions suspended under a State of Emergency since December 1962, others since independence on 1 January 1984) |
| Bulgaria | adopted 12 July 1991 |
| Burkina Faso | 2 June 1991 approved by referendum, 11 June 1991 formally adopted; last amended January 2002 |