| Country | Constitution |
| Oman | none; note - on 6 November 1996, Sultan QABOOS issued a royal decree promulgating a basic law considered by the government to be a constitution which, among other things, clarifies the royal succession, provides for a prime minister, bars ministers from holding interests in companies doing business with the government, establishes a bicameral legislature, and guarantees basic civil liberties for Omani citizens |
| Pacific Ocean | void |
| 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; amended 19 April 2010 |
| Palau | 1 January 1981 |
| Panama | 11 October 1972; revised several times |
| Papua New Guinea | 16 September 1975 |
| Paracel Islands | void |
| Paraguay | promulgated 20 June 1992 |
| Peru | 29 December 1993 |
| Philippines | 2 February 1987, effective 11 February 1987 |
| Pitcairn Islands | The Pitcairn Constitution Order 2010, effective 4 March 2010 |
| Poland | adopted by the National Assembly 2 April 1997; passed by national referendum 25 May 1997; effective 17 October 1997 |
| Portugal | adopted 2 April 1976; subsequently revised
note: the revisions placed the military under strict civilian control, trimmed the powers of the president, and laid the groundwork for a stable, pluralistic liberal democracy; they allowed for the privatization of nationalized firms and government-owned communications media |
| Puerto Rico | ratified 3 March 1952; approved by US Congress 3 July 1952; effective 25 July 1952 |
| Qatar | ratified by public referendum 29 April 2003; endorsed by the Amir 8 June 2004, effective 9 June 2005 |
| Romania | 8 December 1991; revised 29 October 2003 |
| Russia | adopted 12 December 1993 |
| Rwanda | new constitution passed by referendum 26 May 2003 |
| Saint Barthelemy | 4 October 1958 (French Constitution) |
| Saint Helena | The Saint Helena, Ascension and Tristan da Cunha Constitution Order 2009, effective 1 September 2009 |
| Saint Kitts and Nevis | 19 September 1983 |
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