| N |
| N | Naval Staff |
| N&MCM | Navy and Marine Corps Medal |
| NACO | National Agricultrural Credit Office/Organization |
| NAF | Non-appropriated Funds |
| NAG | Naval Advisory Group |
| NAS | National Academy of Sciences |
| NATO | North Atlantic Treaty Organisation |
| NAVADGP | Naval Advisory Group |
| NAVADVGRP | Naval Advisory Group |
| NAVAIDS | Navigational Aids |
| NAVCAT | Naval Civic Action Team |
| NAVCOMMSTA | Naval Communication Station |
| NAVEEACTPHIL | Naval Shore Electronics Engineering Activity - Philippines |
| NAVEEAPAC | Naval Shore Electronics Engineering Agency - Pacific |
| NAVFORV | Naval Forces Vietnam |
| NAVGP | United States Naval Advisory Group |
| NAVILCO | Navy International Logistics Control Office |
| NAVPHIBASE | Naval Amphibious Base |
| NAVSHIPS | Naval Ships System Command |
| NAVSUPPACT | Naval Support Activity |
| NBC | National Broadcasting Corporation |
| NBI | Non-Battle Injuries |
| NBL | No Bomb Line |
| NC | Navy Cross |
| NC | Not Carried |
| NCB | Naval Construction Brigade |
| NCC | National Communications Commission |
| NCC | Naval Component Command (er) |
| NCM | Navy Commendation Medal |
| NCNRC | National Council for National Reconciliation and Concord |
| NCO | Non-Commissioned Officer |
| NCOIC | Non-Commissioned Officer-In-Charge |
| NCR | National Cash Register |
| NCR | Naval Construction Regiment |
| NCS | Net Control Station |
| NDB | Nondirectional Beacon |
| NDC | National Defense Center (United States) |
| NDI | Non-Destructive Inspection |
| NDP | Night Defensive Position |
| NDPS | National Defense Planning System |
| NE | Northeast |
| NEC | Navy Enlisted Classification |
| NEDF | National Economic Development Fund |
| NEMVAC | Noncombatant Emergency Evacuation |
| NETT | New Equipment Training Team |
| NEUT | Neutralist Laotian Forces |
| NFA | Not for Attribution |
| NFI | Not Further Identified |
| NFL | National Front for the Liberation of South Vietnam; also NFLSVN |
| NFLSVN | National Front for the Liberation of South Vietnam |
| NGF | Naval Gunfire |
| NGFS | Naval Gunfire Support |
| NGLO | Naval Gunfire Liaison Officer |
| NHA | Nha Trang |
| NHLS | Neo Lao Hak Sat Party (Communist) |
| NIA | National Institute of Administration |
| NIC | National Interrogation Center |
| NICP | National Inventory Control Point |
| NILCO | Navy International Logistics Control Office |
| NILO | Naval Intelligence Liaison Officer |
| NIRP | National Identification Registration Program |
| NIS | Not In Stock |
| NISOV | Naval Investigatory Service Office, Vietnam |
| NKP | Nakhon Phanom |
| NLC | National Leadership Committee |
| NLC | National Legislative Council |
| NLD | New Life Development |
| NLDT | New Life Development Team |
| NLDV | Negotiated Level Dollar Value |
| NLF | National Liberation Front |
| NLFSV | National Liberation Front of South Vietnam. Often abbreviated as NLF. This was the communist front organization in South Vietnam. Similar in structure to the North Vietnamese government (DRY), it had a central committee, a presidium or politburo and a secretariat with organizational elements running down to the village level. |
| NLFSVN | National Liberation Front of South Vietnam |
| NLH | New Life Hamlet |
| NLHS | Neo Lao Hak Sat (Lao Patriotic Front) |
| NLHX | Neo Lao Hak Xat (Lao Patriotic Front) |
| NLT | Not Later Than |
| nm/NM | Nautical Mile |
| NMASF | Navy Military Assistance Service Funded |
| NMCB | Naval Mobile Construction Battalion |
| NMCC | National Military Command Center (DOD) |
| NMCS | Naval Mobile Construction Support |
| NMMA | National Materiel Management Agency |
| NOAT | Night Operations Assistance Team |
| NOC | Naval Operations Center |
| NOD | Night Observation Devices |
| NOD/MR | Night Observation Device/Medium Range |
| NOFORN | No Foreign/Not Releasable to Foreign Nationals |
| NOK | Next of Kin |
| NOR | Not Operationally Ready |
| NORM | Non-Operationally Ready Maintenance |
| NORS | Not Operationally Ready for Reason of Supply |
| NP | National Police |
| NPA | National Priority Area |
| NPC | National Police Command |
| NPF | National Police Force |
| NPFF | National Police Field Force(s) |
| NRDU | Naval Research & Development Unit |
| NRDU-V | United States Navy Research and Development Unit, Vietnam |
| NRM | National Revolutionary Movement |
| NRTD | Not Reparable This Depot |
| NRTS | Not Reparable This Station |
| NSA | National Security Agency |
| NSA | Naval Support Activity |
| NSA/NAVSUJPPACT | Naval Support Activity |
| NSAD | Naval Support Activity, Da Nang |
| NSAM | National Security Action Memorandum |
| NSAS | Naval Support Activity, Saigon |
| NSC | National Security Council |
| NSC | Naval Supply Center |
| NSD | Naval Supply Depot |
| NSDM | National Security Council Decision Memorandum |
| NSDM | National Security Draft Memorandum |
| NSN | National Stock Number |
| NSN | No Stock Number |
| NSRP | Non-Standard Repair Parts |
| NT | Nang Truong |
| NTC | National Training Center |
| NTC | Naval Training Center |
| NTDS | Naval Tactical Data System |
| NVA | North Vietnamese Army. A common but imprecise term used in many official US documents to identify the North Vietnamese Army. Generally referred to in this volume by its official title, the PAVN. |
| NVA/PANV | North Vietnamese Army/People's Army of North Vietnam |
| NVAF | North Vietnam Air Force; North Vietnamese Armed Forces |
| NVN | North Vietnam; North Vietnamese |
| NVN/PL | North Vietnam/Pathet Lao |
| NVNAF | North Vietnamese Air Force |
| NVNG | North Vietnamese Government |
| NVNN | North Vietnamese Navy |
| NW | Northwest |
| NWC | National War College |
| NWP | Naval Warfare Publication |
| NZ | New Zealand |
| NZA | New Zealand Army |
| NZATTV | New Zealand Army Training Team, Vietnam |
| NZN | New Zealand Navy |
| NZVF | New Zealand Vietnam Force |