| Country | Constitution |
| Germany | 23 May 1949, known as Basic Law; became constitution of the united Germany 3 October 1990 |
| Ghana | approved 28 April 1992 |
| Gibraltar | 5 June 2006; came into force 2 January 2007 |
| Greece | 11 June 1975; amended March 1986 and April 2001 |
| Greenland | 5 June 1953 (Danish constitution) |
| Grenada | 19 December 1973 |
| Guam | Organic Act of Guam, 1 August 1950 |
| Guatemala |  31 May 1985, effective 14 January 1986; suspended 25 May 1993; reinstated 5 June 1993; amended November 1993 |
| Guernsey | unwritten; partly statutes, partly common law and practice |
| Guinea | 23 December 1990 (Loi Fundamentale) |
| Guinea-Bissau | 16 May 1984; amended 4 May 1991, 4 December 1991, 26 February 1993, 9 June 1993, and in 1996 |
| Guyana | 6 October 1980 |
| Haiti |  approved March 1987 note: suspended June 1988 with most articles reinstated March 1989; constitutional government ousted in a military coup in September 1991, although in October 1991, military government claimed to be observing the constitution; returned to constitutional rule in October 1994; constitution, while technically in force between 2004-2006, was not enforced; returned to constitutional rule in May 2006 |
| Heard Island and McDonald Islands | void |
| Holy See (Vatican City) |  Fundamental Law promulgated by Pope JOHN PAUL II on 26 November 2000, effective 22 February 2001 (replaced the first Fundamental Law of 1929) |
| Honduras | 11 January 1982, effective 20 January 1982; amended many times |
| Hong Kong | Basic Law, approved in March 1990 by China's National People's Congress, is Hong Kong's "mini-constitution" |