No news is good news. 沒有消息就是好消息。
No one can call back yesterday. 昨日不會重現。
No pains, no gains. 沒有付出就沒有收穫。
No pleasure without pain. 沒有苦就沒有樂。
No rose without a thorn. 沒有不帶刺的玫瑰。
No sweet without sweat. 先苦後甜。
No smoke without fire. 無風不起浪。
Nothing brave, nothing have. 不入虎穴，焉得虎子。
Nothing dries sooner than a tear. 眼淚乾得最快。
Nothing in the world is difficult for one who sets his mind to it. 世上無難事，只怕有心人。
Nothing is difficult to the man who will try. 世上無難事，只要肯登攀。
Nothing seek, nothing find. 沒有追求就沒有收穫。
Nothing is so necessary for travelers as languages. 外出旅行，語言最要緊。
Nothing is to be got without pains but poverty. 世上唯有貧窮可以不勞而獲。
Not to advance is to go back. 不進則退。
Not to know what happened before one was born is always to be a child. 不懂世故，幼稚可笑。
No way is impossible to courage. 勇者無懼。
Obedience is the first duty of a soldier. 軍人以服從命令爲天職。
Observation is the best teacher. 觀察是最好的.老師。
Offense is the best defense. 進攻是最好的防禦。
Old friends and old wines are best. 陳酒味醇，老友情深。
Old sin makes new shame. 一失足成千古恨。
Once a man and twice a child. 一次老，兩次小。
Once a thief, always a thief. 偷盜一次，做賊一世。
Once bitten, twice shy. 一朝被蛇咬，十年怕井繩。
One boy is a boy, two boys half a boy, three boys no boy. 一個和尚挑水喝，兩個和尚擡水喝，三個和尚沒水喝。
One cannot put back the clock. 時鐘不能倒轉。
