- Horse Names: O -

• O My Gosh
• O'Hare
• Oakie Twister
• Oasis
• Obediente (obedient)
• Oberon
• Obi Wan Kenobi
• Oblivion
• Obsidian Dream
• Occasional Flurries
• Ocean Breeze
• Ocean Jupiter
• Ocean Oasis
• Ocean Quest
• October Rain
• October Spirit
• October Wind
• Oddball
• Odin
• Odyessey's Belle
• Odyssey
• Off Shore Pearls
• Off The Wall
• Office Queen
• Official
• Oh Cash Go
• Oh My Darling
• Oh My Kitty Bar
• Oh No Not You Again
• Oh Passum Easy
• Oil Man's Pay
• Oki Doki
• Oklahoma
• Okotok
• Old Hat
• Old Lady
• Old Man
• Old Style (Mike)
• Old Times
• Old Time's Show
• Old Yeller
• Oldtimer
• Olena Doc Sox
• Oliver
• Olivia
• Olivia Twist
• Ollie
• Oloroso (sweet)
• Olver Twist
• Olympic Dream
• Olympic Glory
• Olympic Medaler
• Olympus
• Omah
• Omega
• On A Platter
• On High Heels
• On Target
• On The Rocker
• On Top Of The World
• On With Jon
• On Your Own
• Once In A Blue Moon
• Once Upon A Time
• One Count
• One Fine Day
• One For My Baby
• One In A Million
• One Lucky Sailor
• One Night Only
• One Sharp Shooter
• One Shot At A Time
• One Top Pine
• One Way Ticket
• One Wish
• Oni (devil)
• Onix
• Onomatopoeia
• Onyx
• Opal
• Opaleye
• Open Fire
• Ophelia
• Opportunityknoxonce
• style="margin: 2px 0in"> Optical Illusion
• Orchid
• Ordered Steps
• Oregold
• style="margin: 2px 0in"> Oreo
• Oreo Star
• Organized Krime
• Organized Rebel
• Ori
• Orinda
• Orion
• Orion's Diamond Ace
• Orion's Opal
• Ornado (ornate)
• Orphan Annie
• Osadia
• Osado (bold, daring)
• Oscar
• Oscuro
• Osebo (leopard)
• Othello
• Otis
• Our Miss
• Our Missing Clue
• Out of the Ground
• Out Of Yesteryear
• Out Past The Moon
• Outlaw
• Outlaw Princess
• Outlook On Things
• Outta Sight
• Ouzo
• Over The Edge
• Over The Limit
• Over The Rainbow
• Over The Sun
• Overtime Magic
• Ozzie