Gabon
| ISO 3166-1 numeric 266 | ISO 3166-1 alpha-3 GAB | ISO 3166-1 alpha-2 GA | ICAO airport code prefix FO | 
| E.164 code 241 | IOC country code GAB | Country code top-level domain .ga | ICAO aircraft regis. prefix TR- | 
| E.212 mobile country code 628 | NATO three-letter code GAB | NATO two-letter code GB | LOC MARC code GO | 
| ITU Maritime ID 626 | ITU letter code GAB | FIPS country code GB | License plate code G | 
| GS1 GTIN prefix — | UNDP country code GAB | WMO country code GO | ITU callsign prefixes TRA-TRZ | 
Gambia
| ISO 3166-1 numeric 270 | ISO 3166-1 alpha-3 GMB | ISO 3166-1 alpha-2 GM | ICAO airport code prefix GB | 
| E.164 code 220 | IOC country code GAM | Country code top-level domain .gm | ICAO aircraft regis. prefix C5- | 
| E.212 mobile country code 607 | NATO three-letter code GMB | NATO two-letter code GA | LOC MARC code GM | 
| ITU Maritime ID 629 | ITU letter code GMB | FIPS country code GA | License plate code WAG | 
| GS1 GTIN prefix — | UNDP country code GAM | WMO country code GB | ITU callsign prefixes C5A-C5Z | 
Georgia
| ISO 3166-1 numeric 268 | ISO 3166-1 alpha-3 GEO | ISO 3166-1 alpha-2 GE | ICAO airport code prefix UG | 
| E.164 code 995 | IOC country code GEO | Country code top-level domain .ge | ICAO aircraft regis. prefix 4L- | 
| E.212 mobile country code 282 | NATO three-letter code GEO | NATO two-letter code GG | LOC MARC code GS | 
| ITU Maritime ID 213 | ITU letter code GEO | FIPS country code GG | License plate code GE | 
| GS1 GTIN prefix 486 | UNDP country code GEO | WMO country code GG | ITU callsign prefixes 4LA-4LZ | 
Germany
| ISO 3166-1 numeric 276 | ISO 3166-1 alpha-3 DEU | ISO 3166-1 alpha-2 DE | ICAO airport code prefix ED, ET | 
| E.164 code 49 | IOC country code GER | Country code top-level domain .de | ICAO aircraft regis. prefix D- | 
| E.212 mobile country code 262 | NATO three-letter code DEU | NATO two-letter code GE | LOC MARC code GW | 
| ITU Maritime ID 211, 218 | ITU letter code D | FIPS country code GM | License plate code D | 
| GS1 GTIN prefix 400-440 | UNDP country code GER | WMO country code DL | ITU callsign prefixes DAA-DRZ, Y2A-Y9Z | 
Ghana
| ISO 3166-1 numeric 288 | ISO 3166-1 alpha-3 GHA | ISO 3166-1 alpha-2 GH | ICAO airport code prefix DG | 
| E.164 code 233 | IOC country code GHA | Country code top-level domain .gh | ICAO aircraft regis. prefix 9G- | 
| E.212 mobile country code 620 | NATO three-letter code GHA | NATO two-letter code GH | LOC MARC code GH | 
| ITU Maritime ID 627 | ITU letter code GHA | FIPS country code GH | License plate code GH | 
| GS1 GTIN prefix 603 | UNDP country code GHA | WMO country code GH | ITU callsign prefixes 9GA-9GZ | 
Gibraltar (British territory)
| ISO 3166-1 numeric 292 | ISO 3166-1 alpha-3 GIB | ISO 3166-1 alpha-2 GI | ICAO airport code prefix LX | 
| E.164 code 350 | IOC country code — | Country code top-level domain .gi | ICAO aircraft regis. prefix VR-G- | 
| E.212 mobile country code 266 | NATO three-letter code GIB | NATO two-letter code GI | LOC MARC code GI | 
| ITU Maritime ID 236 | ITU letter code GIB | FIPS country code GI | License plate code GBZ | 
| GS1 GTIN prefix — | UNDP country code — | WMO country code GI | ITU callsign prefixes — | 
Greece
| ISO 3166-1 numeric 300 | ISO 3166-1 alpha-3 GRC | ISO 3166-1 alpha-2 GR | ICAO airport code prefix LG | 
| E.164 code 30 | IOC country code GRE | Country code top-level domain .gr | ICAO aircraft regis. prefix SX- | 
| E.212 mobile country code 202 | NATO three-letter code GRC | NATO two-letter code GR | LOC MARC code GR | 
| ITU Maritime ID 237, 239, 240, 241 | ITU letter code GRC | FIPS country code GR | License plate code GR | 
| GS1 GTIN prefix 520-521 | UNDP country code GRE | WMO country code GR | ITU callsign prefixes J4A-J4Z, SVA-SZZ | 
Greenland (Kingdom of Denmark)
| ISO 3166-1 numeric 304 | ISO 3166-1 alpha-3 GRL | ISO 3166-1 alpha-2 GL | ICAO airport code prefix BG | 
| E.164 code 299 | IOC country code — | Country code top-level domain .gl | ICAO aircraft regis. prefix OY- | 
| E.212 mobile country code 290 | NATO three-letter code GRL | NATO two-letter code GL | LOC MARC code GL | 
| ITU Maritime ID 331 | ITU letter code GRL | FIPS country code GL | License plate code KN (unofficial) | 
| GS1 GTIN prefix — | UNDP country code — | WMO country code GL | ITU callsign prefixes — | 
Grenada
| ISO 3166-1 numeric 308 | ISO 3166-1 alpha-3 GRD | ISO 3166-1 alpha-2 GD | ICAO airport code prefix TG | 
| E.164 code 1 | IOC country code GRN | Country code top-level domain .gd | ICAO aircraft regis. prefix J3- | 
| E.212 mobile country code 352 | NATO three-letter code GRD | NATO two-letter code GJ | LOC MARC code GD | 
| ITU Maritime ID 330 | ITU letter code GRD | FIPS country code GJ | License plate code WG | 
| GS1 GTIN prefix — | UNDP country code GRN | WMO country code GD | ITU callsign prefixes J3A-J3Z | 
Guadeloupe (region of France)
| ISO 3166-1 numeric 312 | ISO 3166-1 alpha-3 GLP | ISO 3166-1 alpha-2 GP | ICAO airport code prefix TF | 
| E.164 code 590 | IOC country code — | Country code top-level domain .gp | ICAO aircraft regis. prefix F- | 
| E.212 mobile country code 340 | NATO three-letter code GLP | NATO two-letter code GP | LOC MARC code GP | 
| ITU Maritime ID 329 | ITU letter code GDL | FIPS country code GP | License plate code — | 
| GS1 GTIN prefix — | UNDP country code GUD | WMO country code MF | ITU callsign prefixes — | 
Guam (territory of the US)
| ISO 3166-1 numeric 316 | ISO 3166-1 alpha-3 GUM | ISO 3166-1 alpha-2 GU | ICAO airport code prefix PG | 
| E.164 code 1 | IOC country code GUM | Country code top-level domain .gu | ICAO aircraft regis. prefix N- | 
| E.212 mobile country code 535 | NATO three-letter code GUM | NATO two-letter code GQ | LOC MARC code GU | 
| ITU Maritime ID — | ITU letter code GUM | FIPS country code GQ | License plate code — | 
| GS1 GTIN prefix — | UNDP country code — | WMO country code GM | ITU callsign prefixes — | 
Guatemala
| ISO 3166-1 numeric 320 | ISO 3166-1 alpha-3 GTM | ISO 3166-1 alpha-2 GT | ICAO airport code prefix MG | 
| E.164 code 502 | IOC country code GUA | Country code top-level domain .gt | ICAO aircraft regis. prefix TG- | 
| E.212 mobile country code 704 | NATO three-letter code GTM | NATO two-letter code GT | LOC MARC code GT | 
| ITU Maritime ID 332 | ITU letter code GTM | FIPS country code GT | License plate code GCA | 
| GS1 GTIN prefix 740 | UNDP country code GUA | WMO country code GU | ITU callsign prefixes TDA-TDZ, TGA-TGZ | 
Guernsey (British dependency)
| ISO 3166-1 numeric 831 | ISO 3166-1 alpha-3 GGY | ISO 3166-1 alpha-2 GG | ICAO airport code prefix EG | 
| E.164 code — | IOC country code — | Country code top-level domain .gg | ICAO aircraft regis. prefix 2- | 
| E.212 mobile country code — | NATO three-letter code — | NATO two-letter code — | LOC MARC code — | 
| ITU Maritime ID — | ITU letter code — | FIPS country code GK | License plate code GBG | 
| GS1 GTIN prefix — | UNDP country code — | WMO country code — | ITU callsign prefixes — | 
Guinea
| ISO 3166-1 numeric 324 | ISO 3166-1 alpha-3 GIN | ISO 3166-1 alpha-2 GN | ICAO airport code prefix GU | 
| E.164 code 224 | IOC country code GUI | Country code top-level domain .gn | ICAO aircraft regis. prefix 3X- | 
| E.212 mobile country code 611 | NATO three-letter code GIN | NATO two-letter code GV | LOC MARC code GV | 
| ITU Maritime ID 632 | ITU letter code GUI | FIPS country code GV | License plate code RG | 
| GS1 GTIN prefix — | UNDP country code GUI | WMO country code GN | ITU callsign prefixes 3XA-3XZ | 
Guinea-Bissau
| ISO 3166-1 numeric 624 | ISO 3166-1 alpha-3 GNB | ISO 3166-1 alpha-2 GW | ICAO airport code prefix GG | 
| E.164 code 245 | IOC country code GBS | Country code top-level domain .gw | ICAO aircraft regis. prefix J5- | 
| E.212 mobile country code 632 | NATO three-letter code GNB | NATO two-letter code PU | LOC MARC code PG | 
| ITU Maritime ID 630 | ITU letter code GNB | FIPS country code PU | License plate code GW (unofficial) | 
| GS1 GTIN prefix — | UNDP country code GBS | WMO country code GW | ITU callsign prefixes J5A-J5Z | 
Guyana
| ISO 3166-1 numeric 328 | ISO 3166-1 alpha-3 GUY | ISO 3166-1 alpha-2 GY | ICAO airport code prefix SY | 
| E.164 code 594 | IOC country code GUY | Country code top-level domain .gy | ICAO aircraft regis. prefix 8R- | 
| E.212 mobile country code 738 | NATO three-letter code GUY | NATO two-letter code GY | LOC MARC code GY | 
| ITU Maritime ID 750 | ITU letter code GUY | FIPS country code GY | License plate code GUY | 
| GS1 GTIN prefix — | UNDP country code GUY | WMO country code GY | ITU callsign prefixes 8RA-8RZ |