| Trakehner Name | Geschlecht | Geburtsjahr | Vater | Muttertier | Farbe | |
|---|---|---|---|---|---|---|
| Oroonoko xx | Hengst | Unknown | Unknown | |||
| Oropesa xx | Stute | Unknown | Unknown | |||
| Orphanella xx | Stute | Unknown | Unknown | |||
| Orphan Queen xx | Stute | 1967 | Richfield Lad xx | Nimbus Queen xx | Unknown | |
| Orpheus | Hengst | 1972 | Siegbert | Ostia | black | |
| Orphic Annie xx | Stute | Native Uproar xx | Orphic xx | Unknown | ||
| Orphic xx | Jacinto xx | Girse xx | Unknown | |||
| Orrins Burn xx | Stute | Unknown | Unknown | |||
| Orseis xx | Stute | 1897 | St. Serf xx | Orsova xx | bay | |
| Orsenigo xx | Hengst | Unknown | Unknown | |||
| Orsova xx | Stute | Unknown | Unknown | |||
| Ortelsburg | Hengst | Hansakapitän | Eichkatze | bay | ||
| Orunia | Stute | Unknown | Unknown | |||
| Orvita | Stute | Unknown | Unknown | |||
| O'Ryan's Odyssey | Hengst | 1986 | Tannenberg *E* | Hi Tam Michaela | bay | |
| Oryon | Wallach | 2005 | Fandango | Oceana | chestnut | |
| Osadok 25 | Hengst | Unknown | Unknown | |||
| Osage | Stute | 1986 | Merkur *E* | Odessa | bay | |
| Osage Bill xx | Hengst | Majestic Light xx | Charedi xx | |||
| Osage Queen xx | Stute | 1982 | Buck Hill xx | Haughty Lady xx | chestnut | |
| Osage Rose xx | Stute | 1991 | Osage Bill xx | Table Prize xx | chestnut | |
| Osage Teko Bar | Stute | Unknown | Unknown | |||
| Osaka Castle | Wallach | 1998 | Hennessey | Ophilia | brown (gray) | |
| O'Sako xx | Stute | 1981 | Chieftain xx | What Charisma xx | bay | |
| Oscar | Hengst | Unknown | Unknown |