49.Courtesy costs nothing. 謙虛恭敬，不用分文。
50.Cowards are cruel. 懦夫不仁。
51.Credit, like a looking-glass, broken once, is gone, alas! 信譽像鏡子，破碎無法補。
52.Creditors have better memories than debtors. 放債人的記性比借債人好。
53.Crows do not pick crow's eyes. 同室不操戈。
54.Cry up wine and sell vinegar. 掛羊頭，賣狗肉。
55.Cry with one eye and laugh with the other. 口不應心。
56.Curiosity killed the cat. 好奇心，惹禍根。
57.Custom is a second nature. 習慣是第二天性。
58.Custom is the guide of the ignorant. 習俗是無知者的嚮導。
59.Custom makes all things easy. 若照習慣辦，萬事皆不難。
60.Custom rules the law. 習俗影響法律。
61.Custom without reason is but ancient error. 習俗沒有道理，古代謬誤而已。
62.Cut short the nonsense and return to one's muttons. 閒話少說，言歸正傳。
63.Cut the coat according to the cloth. 量布裁衣。liuxuepaper.com