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- Olive, Hubert Ethridge, Sr.
- Olmsted, Denison
- Omaha Beach - East (Colleville-sur-Mer)
- Omaha Beach - East (Colleville-sur-Mer), Reverse
- ominous
- omniscience
- omniscient
- On Assignment in Nepal letter
- On Sacrifice (FDR fireside chat #21)
- On the Banking Crisis: FDR's first fireside chat
- On the home front (FDR fireside chat #23)
- On the Lhotse Face
- On the trail to Banos, Ecuador
- On the way back down Mount Everest
- On Track Learning design packet
- One of the smallest doffers at Cherryville Manufacturing Company
- One Vote Less
- onerous
- Onslow County
- Onslow County Confederate Soldiers Monument
- Onslow County Vietnam Memorial
- Onslow County World War I and World War II Memorial
- ooze
- opaque
- Open book