| nail-biting | | | |
| nail-bitingly | | | |
| nail down | | | |
| nail the hammer on the head | | | |
| naked ape | | | |
| name and shame | | | |
| name names | | | |
| name of the game | | | |
| name one's poison | | | |
| na-na na-na boo-boo | | | |
| Nantucket sleigh ride | | | |
| narrow down | | | |
| nasty, brutish, and short | | | |
| native soil | | | |
| nature abhors a vacuum | | | |
| nature calls | | | |
| nature of the beast | | | |
| near and dear | | | |
| nearest and dearest | | | |
| nearly man | | | |
| near post | | | |
| neat and tidy | | | |
| necessary evil | | | |
| neck and neck | | | |
| necker's knob | | | |
| neck of the woods | | | |
| necktie party | | | |
| needle drop | | | |
| needle in a haystack | | | |
| needle mover | | | |
| needless to say | | | |
| need one's eyes checked | | | |
| need-to-know | | | |
| neither fish, flesh, nor good red herring | | | |
| neither fish nor fowl | | | |
| neither here nor there | | | |
| nerve-shredder | | | |
| nerves of steel | | | |
| nervous hit | | | |
| never in a million years | | | |
| never in a month of Sundays | | | |
| never mind | | | |
| never the twain shall meet | | | |
| never you mind | | | |
| new dawn | | | |
| new hotness | | | |
| new kid in town | | | |
| new kid on the block | | | |
| new normal | | | |
| new school | | | |
| new territory | | | |
| new wine in an old bottle | | | |
| new wine in an old wineskin | | | |
| next-level | | | |
| next thing one knows | | | |
| nice guy | | | |
| nice guys finish last | | | |
| nickel | | | |
| nickel and dime | | | |
| nickel-and-dime | | | |
| nickel nurser | | | |
| nickel tour | | | |
| nigger nose | | | |
| nigger rich | | | |
| night in, night out | | | |
| night out | | | |
| night owl | | | |
| night person | | | |
| Nikon choir | | | |
| nine-day wonder | | | |
| nine times out of ten | | | |
| ninth-inning | | | |
| nip and tuck | | | |
| nip at | | | |
| nip in the bud | | | |
| Nixon in China | | | |
| no and low | | | |
| no biggie | | | |
| no bones about it | | | |
| no borax, no glue | | | |
| no buts | | | |
| no chance | | | |
| no comment | | | |
| no-count | | | |
| nodding acquaintance | | | |
| no dice | | | |
| nod off | | | |
| nod out | | | |
| no flies on | | | |
| no-frills | | | |
| no fun at parties | | | |
| no go | | | |
| no-good ass | | | |
| no great shakes | | | |
| no guts, no glory | | | |
| no hard feelings | | | |
| no harm, no foul | | | |
| no-hit wonder | | | |
| no horse in this race | | | |
| no joy | | | |