| Trakehner Name | Sex | Foaled | Sire | Dam | Color | |
|---|---|---|---|---|---|---|
| Ostrorog | Stallion | Unknown | Unknown | |||
| Ostwind | Stallion | 1981 | Donauschimmer | Oralla xx | bay | |
| Ostwind vom Rappenhof | Mare | 1996 | Carino *E* | Onia | dark bay | |
| O'Tatum | Mare | 2007 | Tanzeln *Pb* | O Lena | bay | |
| Othella | Mare | Othello | Unknown | Unknown | ||
| Othello | Gelding | 1985 | Schubert | Oceanette xx | bay | |
| Othello SF | C | 2005 | Windwalzer *Pg* | Onyx Ladys Mystique | bay | |
| Otoe | Stallion | Unknown | Unknown | |||
| Otoes Honeybee | Otoe | Unknown | Unknown | |||
| Ottawa | Gelding | 1988 | Insterfürst | Odessa | bay | |
| Otter | Stallion | 2000 | Carino *E* | Onia | black | |
| Ottilia xx | Mare | Unknown | Unknown | |||
| Otto | Gelding | 2009 | Pavarotti | Olegra | bay | |
| Otto's Baby xx | Mare | 1969 | Royal Note xx | Kaye's Angel xx | bay | |
| Ottste | Mare | Unknown | Unknown | |||
| Ouida B. xx | Mare | 1961 | Jedgar Ruler xx | Gabby Tillie xx | Unknown | |
| Oui Madame xx | Mare | Unknown | Unknown | |||
| Oukalla xx | Mare | 1951 | Patchouly xx | Naivasha xx | chestnut | |
| Our Ambia xx | Mare | Unknown | Unknown | |||
| Our Babu xx | Stallion | Unknown | Unknown | |||
| Our Beau Belle xx | Mare | Unknown | Unknown | |||
| Our Beau Belle xx (Highland Belle) | Mare | 1982 | Coup de Des xx | Tobie Cole xx | dark bay/brown | |
| Our Candidate | Mare | 1979 | Solling | Just Because | liver chestnut | |
| Our Dad xx | Stallion | Unknown | Unknown | |||
| Our Derby Girl xx | Mare | Unknown | Unknown |