- Caesar's wife must be above suspicion.
- Call a spade a spade.
- Call no man happy till he dies.
- Call no man happy till he is dead.
- Care killed a cat.
- Cast not a clout till May be out.
- Cast not pearls before swine.
- Cast not the first stone.
- Catch as catch can.
- Catch not at the shadow and lose the substance.
- Catch your bear before you sell its skin.
- Charity begins at home.
- Charity covers a multitude of sins.
- Cheats never prosper.
- Children and fools cannot lie.
- Children and fools tell the truth.
- Children should be seen and not heard.
- Choose a wife by your ear rather than by your eye.
- Choose a wife on a Saturday rather than on a Sunday.
- Choose not a wife by the eye only.
- Circumstances alter cases.
- Civility costs nothing.
- Clothes do not make the man.
- Cloudy mornings turn to clear afternoons.
- Coming events cast their shadows before.
- Company in distress makes sorrow light.
- Company in misery makes it light.
- Confession is good for the soul.
- Conscience does make cowards of us all.
- Conscience makes cowards of us all.
- Constant dropping wears away the stone.
- Corruption of the best becomes the worst.
- Counsel is to be given by the wise, the remedy by the rich.
- Counsel must be followed, not praised.
- Count not your chicken before they are hatched.
- Courtesy costs nothing.
- Cowards are cruel.
- Cowards die many times before their deaths.
- Crime does not pay.
- cross the Rubicon
- Cross the stream where it is shallowest.
- Crosses are ladders that lead to heaven.
- Cure the disease and kill the patient.
- Curiosity is endless, restless, and useless.
- Curiosity killed the cat.
- Curses return upon the heads of those that curse.
- Curses, like chickens, come home to roost.
- Custom is another nature.
- Custom makes all things easy.
- Custom reconciles us to everything.
- Cut your coat according to your cloth.