| Country | Constitution |
| Afghanistan | sixth constitution drafted 14 December 2003-4 January 2004; signed 16 January 2004; ratified 26 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 | approved by parliament 21 October 1998; adopted by popular referendum 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, 28 November 1996, 10 April 2002, and 12 November 2008 |
| 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 National Assembly 5 February 2010 |
| 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 | 1 October 1920; revised 1929; reinstated 1 May 1945; revised many times; note - during the period 1 May 1934-1 May 1945 there was a fascist (corporative) constitution in place |
| Azerbaijan | adopted 12 November 1995; modified by referendum 24 August 2002 |
| Bahamas, The | 10 July 1973 |
| Bahrain | adopted 14 February 2002 |
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