| Abbreviation | Definition |
|---|---|
| FGGS | Forensic Genetic Genealogy Searching |
| FGI | Forensic Genealogy Institute |
| FGSP | Fellow, Genealogical Society of Pennsylvania |
| fl | flourit (flourished, living) |
| FMG | Foundation for Medieval Genealogy |
| FN | First Nation |
| FNGS | Fellow, National Genealogical Society |
| FNI | Federation of Newfoundland Indians |
| FO | Fidelity Oath |
| FP | Father's Paternal |
| FPP | family planning programs |
| FSA | Fellow of the Society of Antiquaries |
| FSA | Fellow, Society of Antiquaries |
| FSAG | Fellow, Society of Australian Genealogists |
| FSAScot | Fellow, Society of Antiquaries of Scotland |
| FSG | Fellow, Society of Genealogists |
| FUGA | Fellow, Utah Genealogical Association |
| G | Generation |
| GARD | Gateway Ancestor of Royal Descent |
| GAS | Gender Affirming Surgery |