- O Romeo, Romeo! wherefore art thou Romeo?
- O ye, of little faith
- Odds bodkins
- Off his own bat
- Off the record
- Off with his head
- Offing – In the
- Oh, my stars and garters
- Oh, they have slain the Earl of Moray and Lady Mondegreen
- Okay
- Okey-dokey
- Old as Methuselah
- Old as the hills
- Old chestnut
- Old codger
- Old hat
- auld lang syne
- Old soldiers never die, they simply fade away.
- On a hiding to nothing
- On a wing and a prayer
- On Carey Street
- On cloud nine
- On queer street
- On tenterhooks
- On the ball
- On the bubble
- On the button
- On the dole
- On the fiddle
- On the pig's back
- On the QT
- On the shoulders of giants
- On the side of the angels
- On the wagon
- On the warpath
- On with the motley
- On your beam ends
- On your tod
- Once bitten, twice shy
- Once in a blue moon
- Once more unto the breach, dear friends, once more
- One-hit wonder
- One fell swoop
- One for the road
- One foot in the grave
- One hand washes the other
- One law for the rich and another law for the poor
- One man's meat is another man's poison
- One over the eight
- One sandwich short of a picnic
- One small step for man
- One stop shop
- One swallow doesn't make a summer
- One's heart's content
- Oompa Loompa
- Oops-a-daisy
- Open season
- order of the boot
- Ough – the many ways to pronounce
- Out of sight
- Out of sight, out of mind
- Out of sorts
- Out of the blue
- Out of the frying pan into the fire
- Out of the jaws of death
- Out of the mouths of babes and sucklings
- Out on a limb
- Over a barrel
- Over-egg the pudding
- Over the moon
- Over the top
- Overpaid, oversexed, and over here
- Oxo cube
Sayings that start with the letter O
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