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Once is no rule (custom)
Once bitten, twice shy
On Shank's mare
Old friends and old wine are best
Old birds are not caught with chaff
Of two evils choose the least
Nothing venture, nothing have
Nothing succeeds like success
Nothing so bad, as not to be good for something
Nothing must be done hastily but killing of fleas
Nothing is impossible to a willing heart
Nothing comes out of the sack but what was in it
None so deaf as those that won't hear
None so blind as those who won't see
None but the brave deserve the fair
No wisdom like silence
No sweet without (some) sweat
No song, no supper
No pains, no gains
No news (is) good news
No man loves his fetters, be they made of gold
No man is wise at all times
No longer pipe, no longer dance
No living man all things can
No joy without alloy