| Abbreviation | Definition |
|---|---|
| GRN | Gordon, Nebraska USA |
| GRO | Gerona, Spain |
| GRP | Grurpi, GO, Brazil |
| GRQ | Groningen, Netherlands |
| GRR | Kent County International Airport, Grand Rapids, Michigan USA |
| GRT | Gujrat, Pakistan |
| GRU | Guarulhos International Airport, Sao Paulo, Sao Paulo, Brazil |
| GRU | São Paulo/GuarulhosGovernador André Franco Montoro International Airport |
| GRU | São Paulo/Guarulhos–Governador André Franco Montoro International Airport |
| GRV | Groznyj, Russia |
| GRW | Graciosa Island, Azores, Portugal |
| GRX | Granada, Spain |
| GRY | Grimsey, Iceland |
| GRZ | Graz, Austria |
| GSA | Long Pasia, Malaysia |
| GSAI | El Aaiun, Occidental Sahara |
| GSC | Gascoyne Junction, Western Australia, Australia |
| GSE | Saeve Airport, Gothenburg, Sweden |
| GSH | Goshen, Indiana USA |
| GSN | Mount Gunson, South Australia, Australia |