| NNTTB | | no need to text back |
| NNWW | | Nudge, Nudge, Wink, Wink |
| NO4C | | Not Only For Cows |
| NOBR | | no break |
| noib | | Notice of Intent to Bid |
| NOLM | | no one loves me |
| NOLM | | nonlinear optical loop mirror |
| Noly | | No One Loves You |
| nomb | | none of my business |
| nomdb | | not over my dead body |
| NOMT | | Not on My Time |
| NONYA | | None <of> Ya business |
| nooto | | Nothing Out Of The Ordinary |
| NOP | | No OPeration |
| NOP | | normal operating procedure |
| NOPAT | | Net Operating Profit After Tax |
| NORAD | | North American Aerospace Defense |
| notN | | nothing |
| nottomh | | not of the top of my mind |
| nottomh | | not off the top of my head |
| NOWC | | net operating working capital |
| NOWF | | No one wins forever |
| NOX | | night |
| NOX | | Nitrous OXide |
| NOYL | | Not On Your Life |
| NP-NG | | No Pain-No Gain |
| NPB | | Non Paying Bidder |
| NPC | | Non Player Character |
| NPC | | not politically correct |
| npf | | no problem found |
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