O
| Host | Country | Talk show(s) hosted |
|---|---|---|
| Conan O'Brien | United States | Late Night with Conan O'Brien, The Tonight Show with Conan O'Brien, Conan |
| Rosie O'Donnell | United States | The Rosie O'Donnell Show, The View, The Rosie Show |
| Paul O'Grady | United Kingdom | The Paul O'Grady Show Paul O'Grady Live |
| Bill O'Reilly | United States | The O'Reilly Factor |
| Luis Francisco Ojeda | Puerto Rico | Ojeda, Sin Limites |
| Keith Olbermann | United States | Countdown with Keith Olbermann |
| Sharon Osbourne | United States/ United Kingdom | The Sharon Osbourne Show,The Talk |
| Dr. Mehmet Oz | United States | Dr. Oz |
| Beyazıt Öztürk | Turkey | Beyaz Show |
Read more about this topic: List Of Talk Show Hosts