Huron, LakeHu‧ron, Lake /ˈhjʊərən/ 
the second largest of the great lakes, on the border between the US and Canada
the second largest of the great lakes, on the border between the US and Canada- omniscient
- omnishambles
- omnivore
- omnivorous
- on
- on-air
- Onassis, Aristotle
- Onassis, Jackie
- on-board
- once
- Once in Royal David's City
- once-over
- oncologist
- oncology
- oncoming
- Ondaatje, Michael
- one
- O'Neal, Shaquille
- one another
- one-armed bandit
- one-dimensional
- One Flew Over the Cuckoo's Nest
- one-horse
- One Hundred and One Dalmatians
- O'Neill, Eugene