| Trakehner Name | Sex | Foaled | Sire | Dam | Color | |
|---|---|---|---|---|---|---|
| O Epic ox | Stallion | Unknown | Unknown | |||
| Off Broadway | Stallion | 1981 | Abdullah *Pg*E* | Misfachened xx | chestnut | |
| Off Broadway ox | Stallion | Unknown | Unknown | |||
| Off Chance xx | Stallion | Unknown | Unknown | |||
| Offenbach | Gelding | 1993 | Isidor | Fedora | dark bay | |
| Offenbarung xx | Mare | Unknown | Unknown | |||
| Off Key xx | Stallion | Unknown | Unknown | |||
| Ofir ox | Stallion | 1933 | Kuhailan-Haifi ox | Dziwa ox | bay | |
| Of Wind N Sky | F | 2012 | Virginian Sky | Ovation | bay (gray) | |
| O'Gala | Mare | 2004 | Guarantor (Han) | O'Charlesy *M* | bay | |
| Ogellee | Mare | 1988 | Memphis | Oaklee's Pandera xx | bay | |
| Oglala xx | Mare | 1974 | Chieftain xx | Cheeveetah xx | Unknown | |
| Oglio xx | Stallion | Unknown | Unknown | |||
| Ognennaja | Mare | 1993 | 108 Egoist 35 | Ochota 67 | dark bay/brown | |
| Ognennaya 71 | Mare | Unknown | Unknown | |||
| Ognica | Mare | Unknown | Unknown | |||
| Ognifa | Mare | Falkner II | Ognica | Unknown | ||
| Ogygian xx | Stallion | Unknown | Unknown | |||
| Ohadi Ben Rabba ox | Stallion | Unknown | Unknown | |||
| O'Hara's Legend xx | Mare | Unknown | Unknown | |||
| O'Hara's Poise xx | Mare | Unknown | Unknown | |||
| Oh Boy | Stallion | 1985 | Tannenberg *E* | Beschatten | bay | |
| Oh Gee Whiz | Gelding | 2000 | Onassis *E* | Myheirs Girlfriend | dark bay | |
| Ohio Queen xx | Mare | Unknown | Unknown | |||
| Oh My Cutie | Mare | Old Pueblo xx | Callmecutie | Unknown |