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Chapter 9.
- NAS — National Academy of Sciences
- NASA — National Aeronautics and Space Administration
- NATO— North Atlantic Treaty Organization
- NCUA— National Credit Union Administration
- NE. — northeast
- n.e.c. — not elsewhere classified
- n.e.s. — not elsewhere specified
- net wt. — net weight
- N.F. — National Formulary
- NFAH — National Foundation on the Arts and the Humanities
- NIH— National Institutes of Health
- NIST— National Institute of Standards and Technology
- n.l. — natural log or logarithm
- NLRB— National Labor Relations Board
- NNTP — Network News Transfer Protocol
- No. — Nos., number, numbers
- NOAA — National Oceanic and Atmospheric Administration
- n.o.i.b.n. — not otherwise indexed by name
- n.o.p. — not otherwise provided (for)
- n.o.s. — not otherwise specified
- NOVS— National Office of Vital Statistics
- NPS — National Park Service
- NRC — Nuclear Regulatory Commission
- NS — nuclear ship
- NSA — National Shipping Authority
- NSC — National Security Council
- NSF — National Science Foundation
- n.s.k. — not specified by kind
- n.s.p.f. — not specifically provided for
- NW. — northwest
- OAPEC — Organization of Arab Petroleum Exporting Countries
- OAS — Organization of American States
- OASDHI— Old-Age, Survivors, Disability, and Health Insurance Program
- OASI — Old-Age and Survivors Insurance
- OCD— Office of Civil Defense
- OD — officer of the day
- OD — overdose; Odd, overdosed
- OD. — doctor of optometry
- OECD — Organization for Economic Cooperation and Development
- OK— Oked, Oking, Oks
- OMB— Office of Management and Budget
- Op. Atty. Gen. — Opinions of the Attorney General
- op. cit. — (opere citato) in the work cited
- OPEC — Organization of Petroleum Exporting Countries
- OSD — Office of the Secretary of Defense
- OTC — Organization for Trade Cooperation
- PA — public address system
- Pac. — Pacific Reporter; P.2d, Pacific Reporter, second series
- PAC — political action committee (plural PAC's)
- Passed Asst. Surg. — passed assistant surgeon
- PBS — Public Building Service
- PCV — Peace Corps Volunteer
