| Acronym | Definition |
|---|
| NNF | Negation Normal Form |
| NNF | Never Not Funny (podcast) |
| NNF | No New Friends |
| NNF | Not Not Fun (record label; Los Angeles, CA) |
| NNF | Namibia Nature Foundation |
| NNF | Negation Normal Form (logic) |
| NNF | Name Not Final (gaming; World of Warcraft) |
| NNF | National Nanofabrication Facility (Cornell University) |
| NNF | National Nothing Foundation |
| NNF | No Name Face (album title) |
| NNF | Norsk Nettverksforum |
| NNF | Nearest Neighbor Filter |
| NNF | Normally No Flow (piping) |
| NNF | Narrowband Nebular Filter |
| NNF | Nonreactor Nuclear Facility |
| NNF | No Fault Found (electronic device testing) |
| NNF | No Name Found (band) |