| National Nutrition Program | National Oak Flooring Manufacturers Association | National Oak Wilt Symposium | National Obesity Surgery Centre | National Obesity Task Force |
| National Obituary Archive | National Obscenity Enforcement Unit | National Obscenity Law Center | National Observational Study of the Effectiveness of the CleanYourHandsCampaign | National Observatory of Athens |
| National Obsolescence Centre | National Occupational Competency Testing Institute | National Occupational Information Coordination Committee | National Occupational Mortality Surveillance | National Occupational Research Agenda |
| National Occupational Respiratory Mortality System | National Occupational Safety and Health | National Occupational Safety and Health Committee | National Occupational Safety Association | National Occupational Standards |
| National Occupational Standards Board | National Ocean Access Project | National Ocean Council | National Ocean Economics Program | National Oceanic and Atmospheric Administration |
| National Oceanic and Atmospheric Administration Corps | National Oceanic and Atmospheric Administration - National Weather Service | National Oceanic and Deposition Program | National Oceanic Resource Management Authority | National Oceanic Satellite System |
| National Ocean Industries Association | National Oceanographic and Maritime Institute | National Oceanographic Data Center | National Oceanographic Data Center's Ocean Climate Laboratory | National Oceanographic Instrumental Center |
| National Oceanographic Partnership Program | National Oceanographic Research Institute | National Oceanography Association | National Oceanography Centre | National Oceanography Centre, Southampton |
| National Ocean Outfall Closure Strategy | National Ocean Policy | National Ocean Policy Study | National Ocean Research Leadership Council | National Oceans Advisory Group |
| National Ocean Science | National Ocean Science Bowl | National Ocean Science Forum | National Ocean Sciences Accelerator | National Ocean Sciences AMS Facility |
| National Ocean Sciences Bowl | National Ocean Service | National Oceans Ministerial Board | National Ocean Survey | National Odd Shoe Exchange |
| National Odor Recognition Test | National Offender Management Information System | N,N-Dipropyltryptamine | NNDK | NNDKP |
| NNDO | NNDP | NNDPA | NNDPM | NNDPU |
| NNDR | NNDRC | NNDS | NNDSB | NNDSS |
| NNDT | NNE | NNEA | NNEAA | NNEAHSA |
| NNEB | NNEC | NNECA | NNECAPA | NNECDSG |
| NNECFC | NNECN | NNECOS | NNECPA | NNED |
| NNEDAOG | NNEDC | NNEDSC | NNEDV | NNEEC |
| NNEF | NNEG | NNEGC | NNEHIF | NNEI |
| NNEL | NNELL | NNEM | NNEMA | NNEMP |
| NNEMS | NNEO | NNEOMT | NNEP | NNEPA |
| NNEPC | NNEPI | NNEPQIN | NNEPRA | NNER |
| NNEREN | NNERN | NNES | NNESCC | NNESEA |
| NNESI | NNEST | NNET | N,n'-Ethylenebis-2- | N,n'-Ethylenebis-2- (O-Hydroxyphenyl) Glycine |
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