| Unquestionable | Belmont,
15-Aug-11 |
| Unquestionable | Ascot,
30-Apr-25 |
| Unquestionably | Darwin,
04-Aug-25 |
| UNQUESTIONED | Orange,
17-Apr-09 |
| Unraptured | Mountaineer,
10-Sep-25 |
| Unravel | Queanbeyan,
29-Nov-24 |
| Unreachable | Rosehill Gardens,
13-Sep-25 |
| Unreachable Star | Bendigo,
03-Jun-10 |
| Unreal | Innisfail,
03-Jan-15 |
| Unreal | Canterbury Park,
11-Jun-23 |
| Unreal Connection | Kempton,
30-Jan-25 |
| Unreal Deal | Kembla Grange,
04-Nov-14 |
| Unreal Expectation | Newcastle,
01-Nov-25 |
| Unrealistic | The Valley,
15-Jan-21 |
| UNREASONABLE | |
| Unreasonable | Kentucky Downs,
29-Aug-25 |
| Unreasonable | Keeneland,
14-Apr-24 |
| Unrefuseable | Toowoomba Cushion Track,
09-Mar-13 |
| Unregretted | Kentucky Downs,
04-Sep-23 |
| Unregulated | Redcar,
10-Aug-24 |
| Unrelated | Murray Bridge GH,
08-Sep-19 |
| UNRELENT | |
| Unrelenting | Royal Randwick,
09-Dec-23 |
| Unrelenting | Horseshoe Indianapolis,
03-Oct-25 |
| Unrelentless | Los Alamitos Racecourse,
12-Oct-25 |
| Unreliable Critic | Moree,
01-Nov-24 |
| Unrequited Love | Wolverhampton,
05-Mar-23 |
| Unresolved | Gatton,
31-Jan-21 |
| Unrestrained | Ellerslie,
18-Oct-25 |
| Unrestricted | Charleville,
05-Nov-24 |
| Unrestricted | Remington Park,
10-Sep-23 |
| Unriddle | Sale,
26-Oct-25 |
| Unrivaled Hero | Del Mar,
09-Aug-25 |
| Unrivaled Queen | Canterbury Park,
30-Jun-25 |
| Unrivaled Time | Santa Anita,
20-Oct-25 |
| Unrivaled Treasure | Lone Star,
04-May-24 |
| Unrivalled | Ascot,
02-Dec-09 |
| Unruffled | Sale,
02-Jul-17 |
| Unruffled | Chantilly,
31-Oct-23 |
| Unruly Dame | TRIAL Lark Hill,
14-Nov-22 |
| Unruly Julie | Aqueduct,
13-Nov-23 |
| Unruly Student | Sale,
09-Jul-20 |
| UNSAFE | |
| Unsaid | San Isidro,
21-Dec-24 |
| Unsaid Dreams | TRIAL Belmont,
27-Mar-23 |
| Unsaid Vow | Funabashi,
21-Jul-23 |
| Unscathed | Green Wattle,
17-Mar-11 |
| Unscented | Warrnambool,
08-Jan-23 |
| Unscripted | Hawera,
06-May-25 |
| Unscrupulous | Bendigo,
08-Jul-15 |
| Unseal | Tokyo,
02-Nov-25 |
| Unseemly | Lone Star Park,
01-Nov-25 |
| Unseen | Saga,
01-Nov-25 |
| Unseen | Meadowlands,
16-Sep-23 |
| Unseen Ruler | Moonee Valley,
23-Aug-25 |
| Unser Scheinen | Nagoya,
14-Feb-25 |
| Unshackled | Arawa Park,
13-Aug-25 |
| Unshakable | Colonial Downs,
04-Sep-25 |
| Unshinkable | Gilgandra,
18-Aug-18 |
| Unshockable | Bendigo,
15-Dec-19 |