| Abbreviation | Definition |
|---|---|
| GCVO | Grand Cross of the Royal Victorian Order |
| GED | a GEDCOM file |
| GED | GEDCOM file |
| GEDCOM | GEnealogical Data COMmunications program to transfer data |
| GEN | GENeral |
| gen. | generation |
| gent | gentleman |
| GENTECH | GENealogy and TECHnology |
| GFS | Genealogy Forum Staff |
| GGF | great grandfather |
| ggfa | great great grandfather |
| GGFO | Genetic Genealogy Forums Online |
| GGK | Genetic Genealogy Kit |
| GGM | great grandmother |
| ggmo | great great grandmother |
| GIMA | Genealogical Institute of Mid-America (University of Illinois-Springfield) |
| GIT | Genealogical Institute of Texas |
| GMO | GrandMOther |
| GNTP | Genealogy Network Transfer Protocol |
| GQL | Genome Query Language |