| Acronym | Meaning |
| NA | Not Available Not Applicable Not Announced |
| NAA | Not At All |
| NAACP | National Association for the Advancement of Colored People |
| NABD | Not A Big Deal |
| NAC | Not A Chance Not A Chain (letter) |
| NAGL | Not A Good Look |
| NAK | Nursing At Keyboard |
| NAL | Need A Life |
| NALGAS | Buttocks |
| NALGO | Not A Lot Going On |
| NALOPKT | Not A Lot Of People Know That. |
| NAMBLA | North American Man/Boy Love Association |
| NAP | Not A Problem |
| NARP | Non-Athletic Regular Person |
| NARU | Not A Registered User |
| NAS | Network Attached Storage |
| NASA | National Aeronautics and Space Administration |
| NASCAR | National Association for Stock Car Auto Racing |
| NASDAQ | National Association of Securities Dealers Automated Quotation |
| NASL | Name, Age, Sex, Location |
| NATM | Not At The Moment |
| NATO | North Atlantic Treaty Organization No Action Talk Only |
| NATTY | Natural Light beer Smart, good, cool |
| NB | Not Bad Nota Bene (Latin for please note) |
| NBA | National Basketball Association |
| NBB | Never Been Better |
| NBC | National Broadcasting Company |
| NBD | No Big Deal |
| NBF | New Best Friend |
| NBG | Nasty But Good |
| NBIF | No Basis In Fact |
| NBK | Natural Born Killers Never Been Kissed |
| NBM | Nil By Mouth Not Before Midnight |
| NBSB | No Boyfriend Since Birth |
| NBT | Nothing But Trouble |
| NBTD | Nothing Better To Do |
| NBTW | Now Back To Work |
| NC | No Comment No Choice |
| NC-17 | No Children under 17 (movie rating) |
| NCAA | National Collegiate Athletic Association |
| NCB | Never Coming Back |
| NCIS | Naval Criminal Investigative Service (TV show) |
| NCMO | Non-Committal Make Out |
| NCNR | Non-Cancelable, Non-Returnable |
| NCNS | No Call, No Show |
| NCO | Non-Commissioned Officer |
| NDA | Non-Disclosure Agreement |
| NDE | Near Death Experience |
| NDI | Neither Do I |
| NDP | New Democratic Party |
| NDR | Non-Delivery Report/Receipt |
| NDS | Nintendo DS |
| NEA | National Education Association |
| NED | Non-Educated Delinquent |
| NEDM | Not Even Doom Music |
| NEET | Not in Education, Employment or Training |
| NEGL | Not Even Gonna Lie |
| NEGU | Never Ever Give Up |
| NEI | Not Enough Information |
| NER | Non-Existent Relationship |
| NF | Not Funny |
| NFA | No Further Action |
| NFAA | Not Funny At All |
| NFI | No Freakin Idea |
| NFL | National Football League |
| NFM | No Further Message |
| NFN | Normal For Norfolk |
| NFS | Not For Sale |
| NFSW | Not For Showing Wife |
| NFT | No Further Text |
| NFY | Not Fixed Yet |
| NFZ | No Fly Zone |
| NG | No Good |
| NGH | Not Gonna Happen |
| NGL | Not Gonna Lie |
| NGO | Non-Governmental Organization |
| NGU | Never Give Up |
| NGUNS | Never Give Up, Never Surrender |
| NH | Nice hand (poker slang) |
| NHB | No Holding Back No Holds Barred |
| NHD | No Harm Done |
| NHF | No Hard Feelings |
| NHFT | Not Here For That |
| NHL | National Hockey League |
| NHN | Not Here Now |
| NHOI | Never Heard Of It |
| NHS | National Health Service |
| NHTB | Never Heard That Before |
| NI | No Idea |
| NIAMY | Never In A Million Years |
| NIB | New In Box |
| NIC | Network Interface Card |
| NICE | National Institute of Clinical Excellence |
| NICU | Neonatal Intensive Care Unit |
| NID | Never In Doubt |
| NIK | Now I Know |
| NIMBY | Not In My Back Yard |
| NIML | Never In My Life Not In My Lifetime |
| NIN | Nine Inch Nails |
| NISM | Need I Say More? |
| NITM | Not In The Mood |
| NITW | Not In That Way |
| NJ | Not Joking Nice Job |
| NJPW | New Japan Pro Wrestling |
| NK | No Kidding Not Known |
| NKA | No Known Allergies |
| NKOTB | New Kid On The Block |
| NKZ | No Kill Zone |
| NLA | No Longer Available |
| NLI | Not Logged In |
| NLM | No Laughing Matter |
| NLT | No later than… |
| NLYG | Never Let You Go |
| NM | Never Mind Nothing Much No Message |
| NME | New Musical Express (magazine) |
| NMF | Not My Fault |
| NMG | No Mames Guey (OMG) |
| NMH | Nodding My Head |
| NMHJC | Not Much Happening Just Chilling |
| NMI | Need More Info |
| NMJ | Not My Job |
| NMJC | Not Much Just Chat |
| NMJCU | Not Much, Just Chillin’, U? |
| NMN | No Middle Name |
| NMO | Not My Opinion |
| NMP | Not My Problem |
| NMR | Not My Responsibility |
| NMS | Not My Style |
| NMT | Not My Type |
| NMU | Not Much, You? |
| NMW | No Matter What |
| NMWH | No Matter What Happens |
| NMY | Nice Meeting You |
| NN | Night Night No Need Not Nice |
| NNITO | Not Necessarily In That Order |
| NNTO | No Need To Open |
| NNTP | Network News Transfer Protocol |
| NNTR | No Need To Reply |
| NOC | No One Cares |
| NOI | No Offense Intended |
| NOK | Not Okay No One Knows |
| NOKD | Not Our Kind, Dear |
| NOLY | No One Likes You |
| NOM | No Offence Meant |
| NOMB | None Of My Business |
| NOS | New Old Stock |
| NOTA | None Of The Above |
| NOTB | None Of Their Business |
| NOTW | Not Of This World |
| NOYB | None Of Your Business |
| NOYDB | None Of Your Damn Business |
| NP | No Problem |
| NPAA | No Problem At All |
| NPC | Non Player Character ( ) |
| NPI | No Pun Intended |
| NPNT | No Picture, No Talk |
| NPO | Never Pull Out |
| NPR | National Public Radio No Purchase Required |
| NPW | No Problem Whatsoever |
| NPZ | No Problems |
| NQAT | No Question About That |
| NQR | Not Quite Right |
| NR | No Reply No Reserve |
| NRA | National Rifle Association |
| NRE | New Relationship Energy |
| NRFB | Never Removed From Box |
| NRI | Non-Resident Indian Non-Repairable Item |
| NRL | National Rugby League |
| NRN | No Reply Necessary |
| NSA | No Strings Attached |
| NSAW | Not Saying A Word |
| NSD | Never Say Die |
| NSF | Not Sufficient Funds Not So Fast |
| NSFA | Not Safe For Anyone |
| NSFL | Not Safe For Life |
| NSFTBC | Not Sorry For The Broadcast |
| NSFV | Not Safe for Viewing/Vegetarians/Vegans |
| NSFW | Not Safe For Work |
| NSM | Not So Much |
| NSN | Not So Nice |
| NSPCC | National Society for Prevention of Cruelty to Children |
| NSW | New South Wales |
| NT | No Thanks |
| NTB | Not That Bothered Not Too Bad |
| NTBCW | Not To Be Confused With |
| NTD | Nothing To Do |
| NTFS | New Technology File System |
| NTK | Need To Know |
| NTL | NeverTheLess |
| NTM | Not Too Much Nothing Much |
| NTMY | Nice To Meet You |
| NTN | No Thanks Needed |
| NTR | Nothing To Report |
| NTS | Nothing To Say Note To Self |
| NTSC | National Television System Committee video standard |
| NTSH | Nothing To See Here |
| NTT | Name That Tune Not Touching That! |
| NTTAWWT | Not That There’s Anything Wrong With That |
| NTTU | Not Talking To You |
| NTW | Not To Worry |
| NTWF | Neopian Times Writers Forum |
| NTY | No Thank You |
| NUS | National Union of Students |
| NVMS | No Visible Means of Support |
| NVN | Not Very Nice |
| NVNG | Nothing Ventured, Nothing Gained |
| NW | No Way |
| NWIH | No Way In Hell |
| NWIM | Not What I Mean |
| NWJ | No Way Jose |
| NWLY | Never Wanna Lose You |
| NWM | No Worries Mate |
| NWNC | No Woman, No Cry |
| NWO | New World Order |
| NWOT | New Without Tags (eBay) |
| NWS | Not Work Safe – for messages/sites containing adult content |
| NWT | New With Tags |
| NY | New York |
| NYB | Not Your Business |
| NYC | New York City |
| NYD | New Year’s Day |
| NYE | New Years Eve |
| NYF | Not Your Fault |
| NYI | Not Yet Implemented |
| NYK | Not Yet Known Now You Know |
| NYOB | Not Your Own Business |
| NYP | Not Your Problem |
| NYPD | New York Police Department |
| NYSE | New York Stock Exchange |
| NYT | Not Your Type New York Times |
| NYU | New York University |