| Abbreviation | Definition |
|---|---|
| NYCH | National Youth Coalition for Housing |
| NYCHA | New York City Housing Authority |
| O/DPOOL | OutDoor Pool |
| O/DR | OutDooR |
| O/PLAN | Open Plan |
| O/S | OutSide |
| O/S | OverSeas |
| occ. | occupant |
| OCCH | Ohio Capital Corporation for Housing |
| OCHA | Off Campus Housing Affairs |
| OCHA | Off Campus Housing Assistance |
| OFFSTPK | Off Street Parking |
| OFP | Open FirePlace |
| OFR | Ocean Front Room |
| OH | Organized Home |
| OHAC | Ohio Housing Authorities Conference |
| OHIP | Online Housing Information Project |
| OHM | Other Household Member |
| OMHA | Oregon Manufactured Housing Association |
| OPOS | Operating Procedures Outline Sheet |