| Abbreviation | Definition |
|---|---|
| NYGBS | New York Genealogical and Biographical Society |
| NZSG | New Zealand Society of Genealogists |
| O/S | Opposite Side |
| OB | OBdormio (died) |
| ob. | died (obit [Lat.]) |
| OFPA | Order of the Founders and Patriots of America |
| OGF | Östgota Genealogiska Forening |
| OS | Old Style |
| OSP | Obiit Sine Prole |
| osp | obiit sine prole (died without issue) |
| P | Post- |
| p | post (after; page) |
| P.S. | Patriotic Service |
| PA | Papers submitted (e.g., naturalization papers) |
| PalAm | PALatines to AMerica |
| par | parish |
| PARG | Poly ADP Ribose Glycohydrolase |
| PCGS | Pima County Genealogy Society |
| PERSI | PERiodical Source Index |
| PG | Page |