| Flag | Code | Country | Time Difference (GMT) | Group | Comment | Internet Code |
 | 34 | Canary Islands | 1 | SPAIN | | es |
 | 241 | GABON | 1 | | | ga |
 | 220 | GAMBIA (Republic of the) | -1 | BCW | | gm |
 | 995 | GEORGIA | 4 | | Formally part of USSR | ge |
 | 49 | GERMANY (Federal Republic of) | 1 | EU, NATO | | de |
 | 233 | GHANA | 0 | BCW | | gh |
 | 350 | GIBRALTAR | 1 | EU, BRD | | gi |
 | 8818 | Globalstar Inc | | GLOBAL | | |
| 8819 | Globalstar Inc | | GLOBAL | | |
| 881 | GMSS | | GLOBAL | Global Mobile Satellite System | |
| 8816 | GMSS Iridium | | GLOBAL | | |
| 8817 | GMSS Iridium | | GLOBAL | | |
| 88234 | Gobal Networks Switzerland | | GLOBAL | | |
| 44 | Great Britain | 0 | UK | England-Scotland-Wales | uk |
 | 30 | GREECE | 2 | EU, NATO | | gr |
 | 299 | GREENLAND (Denmark) | -1 to -4 | | | gl |
 | 1473 | GRENADA | -4 | WIN, BCW | includes Carriacou | gd |
| 388 | Group of Countries | | GLOBAL | Shared code | |
 | 590 | GUADELOUPE (French Department of) | -4 | | | gp |
 | 1671 | GUAM | 10 | | was Mariana Islands | gu |
| 5399 | Guantanano Bay | -5 | | Cuba | |
 | 502 | GUATEMALA (Republic of) | -6 | | | gt |
 | 44 | Guernsey | 0 | UKD, CI | | gg |
 | 224 | GUINEA (Republic of) | 0 | | | gn |
 | 245 | GUINEA-BISSAU (Republic of) | 0 | | | gw |
 | 592 | GUYANA | -4 | BCW | | gy |