Here is a list of horse names starting with O. Click on the linked names for history and meaning of these horse names.
| O my Gosh | O.Brien | Oak |
| Oasis | Oberon | Obi-Wan |
| Oblivion | Obsidian Dream | Occasional Flurries |
| Ocean | Ocean Breeze | Ocean Crest |
| Ocean Jupiter | October Spirit | October Wind |
| Oddball | Oddossen Dreamer | Odin |
| Odyssy | Odyssy | Off Shores Pearl |
| Official | Oh Cash Go | Oh my Darling |
| OJ | Oki Doki | Okotok |
| Old Faithful | Old Lady | Oliver |
| Oliver twist | Olivia | Ollie |
| Olympic Dream | Olympic Glory | Olympus |
| Omah | On High Heels | On target |
| On With Jon | Once in a Blue Moon | One Fine Day |
| One in a Million | One Night Only | One O’clock Call |
| One Shot At A Time | One Way Ticket | One Wish |
| Oni (japanese for devil) | Onix | Onyx |
| Opal | Opaleye | Oppey |
| Orchid | Ordered Steps | Oreo |
| Organized Rebel | Orion | Orkney Mist |
| Oscar | Othello | Otis |
| Outlaw | Outta Sight | OverTime Magic |
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