| One chick keeps a hen busy |
| One drop of poison infects the whole tun of wine |
| One fire drives out another |
| One good turn deserves another |
| One law for the rich, and another for the poor |
| One lie makes many |
| One link broken, the whole chain is broken |
| One man's meat is another man's poison |
| One man, no man |
| One scabby sheep will mar a whole flock |
| One swallow does not make a summer |
| One today is worth two tomorrow |
| Open not your door when the devil knocks |
| Opinions differ |
| Opportunitymakes the thief |
| Out of sight, out of mind |
| Out of the frying-pan into the fire |
| Packed like herrings |
| Patience is a plaster for all sores |
| Penny-wise and pound-foolish |
| Pleasure has a sting in its tail |
| Plenty is no plague |
| Politeness costs little (nothing), but yields much |
| Poverty is no sin |
| Poverty is not a shame, but the being ashamed of it is |
| Practise what you preach |
| Praise is not pudding |
| Pride goes before a fall |
| Procrastination is the thief of time |
| Promise is debt |
| Promise little, but do much |
| Prosperity makes friends, and adversity tries them |
| Put not your hand between the bark and the tree |
| Rain at seven, fine at eleven |
| Rats desert a sinking ship |
| Repentance is good, but innocence is better |
| Respect yourself, or no one else will respect you |
| Roll my log and I will roll yours |
| Rome was not built in a day |
| Salt water and absence wash away love |
