- Mark O'Connell
- John O'Connell
- Kristin O'Connor
- Ian O'Connor
- Simon O'Connor
- Flannery O'Connor
- Carlene O'Connor
- Justin O'Connor
- Jane O'Connor
- Jim O'Connor
- William O'Connor
- Deborah O'Connor
- Frank O'Connor
- Rory O'Connor
- George O'Connor
- Barbara O'Connor
- Joseph O'Connor
- John O'Connor
- Tomohito Oda
- Eiichiro Oda
- Aiwanose Odafen
- Hotaru Odagiri
- Toshio Odate
- Karen Odden
- David Odell
- Scott O'Dell
- Felicity O'Dell
- Michel Odent
- Daniel Odier
- Jey Odin
- David O'Doherty
- Wendell Odom
- Peter O'Donnell
- Kate O'Donnell
- Douglas Sean O'Donnell
- Caroline O'Donoghue
- John O'Donohue
- Geraldine O'Dowd
- Maggie O'Farrell
- John O'Farrell
- St Teresa Of Avila
- The Countess Of Carnarvon
- Nick Offerman
- Gemma Bird AKA Money Mum Official
- Jenny Offill
- Paul A. Offit
- Paul Offit
- Sheila O'Flanagan
- Catherine O'Flynn
- Danielle Ofri
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