- Oakview Lodge
- Lodge near Stone Mountain, Georgia, where Margaret and Charles stayed. Jarod returns there with Davy. Bloodlines
- Odd duck
- Reference to Jarod Silence
- Odekirk Utility knife
- RJ won one as a prize as a kid, lost it to Nigel Brinkman, and that knife was used to damage the throttle cable on his car. Indy Show
- Old Bridge Road
- Where Thomas was stargazing with his new telescope and Parker went to meet him.
- Olympia Fields Apartments
- Where Patty lives and where Jarod caught up with Pavlov. PTB
- Onisius
- Origami figure found in Jarod’s room. Miss Parker refers to it as Onisius, the Greek God of retribution. (The Greek Goddess of retribution is actually Nemesis.) Pilot
- Operation Dustoff
- A joint mission with the Colombian military to infiltrate and destroy narcotics processing factories. Collateral Damage
- Optimised nutritional supplement
- The food Jarod was raised on. A green goopy mess of wheat grass, tomato and hearts of palm
- Orlani
- Restaurant in Atlantic City. Unsinkable
- Orphan Boy
- Reference to Jarod when he subs on talk back radio PTB
- Osborne Flight School
- Flight school in North Carolina, run by Carrie Osborne. Brigitte attempted to murder Major Charles by causing his plane engine to fail.
- Outbreak Simulation
- Sim used in the field, 46 people died of the Ebola Virus. Pilot