| Country | Country name |
| Gabon | conventional long form: Gabonese Republic conventional short form: Gabon local long form: Republique Gabonaise local short form: Gabon |
| Gambia, The | conventional long form: Republic of The Gambia conventional short form: The Gambia |
| Gaza Strip | conventional long form: none conventional short form: Gaza Strip local long form: none local short form: Qita' Ghazzah |
| Georgia | conventional long form: none conventional short form: Georgia local long form: none local short form: Sak'art'velo former: Georgian Soviet Socialist Republic |
| Germany | conventional long form: Federal Republic of Germany conventional short form: Germany local long form: Bundesrepublik Deutschland local short form: Deutschland former: German Empire, German Republic, German Reich |
| Ghana | conventional long form: Republic of Ghana conventional short form: Ghana former: Gold Coast |
| Gibraltar | conventional long form: none conventional short form: Gibraltar |
| Greece | conventional long form: Hellenic Republic conventional short form: Greece local long form: Elliniki Dhimokratia local short form: Ellas or Ellada former: Kingdom of Greece |
| Greenland | conventional long form: none conventional short form: Greenland local long form: none local short form: Kalaallit Nunaat |
| Grenada | conventional long form: none conventional short form: Grenada |
| Guam | conventional long form: Territory of Guam conventional short form: Guam local long form: Guahan local short form: Guahan |
| Guatemala | conventional long form: Republic of Guatemala conventional short form: Guatemala local long form: Republica de Guatemala local short form: Guatemala |
| Guernsey | conventional long form: Bailiwick of Guernsey conventional short form: Guernsey |
| Guinea | conventional long form: Republic of Guinea conventional short form: Guinea local long form: Republique de Guinee local short form: Guinee former: French Guinea |