| Unified Command | Charles Town,
24-Aug-25 |
| Unified Conquest | Gulfstream,
28-Oct-23 |
| Unified Dreams | Canterbury Park,
27-May-25 |
| Unified Front | Woodbine,
17-Nov-23 |
| Unified Identity | Saratoga,
21-Aug-25 |
| Unified Love | Sam Houston Race Park,
10-Mar-25 |
| Unified Play | Laurel Park,
03-Feb-23 |
| Unified Report | Horseshoe Indianapolis,
13-May-25 |
| Unified Ride | Monmouth Park,
31-Jul-23 |
| Unified Usyk | Fairmount Park,
03-Sep-25 |
| Unified Weekend | Charles Town,
04-Oct-25 |
| Unifieds Princess | Tampa Bay Downs,
05-May-25 |
| Unifies | Moe,
04-Sep-25 |
| Uniflyer | Cessnock,
08-Oct-12 |
| Unifying | Kentucky Downs,
30-Aug-24 |
| Unigena | Pau,
18-Feb-25 |
| Unika | Valparaiso Sporting Club,
03-Aug-23 |
| Unika Etoile | Huntingdon,
10-Feb-23 |
| Unikat | Esperance,
13-Feb-21 |
| Unikee | Gulfstream,
08-Mar-24 |
| UNIKIN | Tamworth,
30-Jan-15 |
| Unilateral | Woodbine,
25-Nov-23 |
| Unilateralism | Beverley,
08-Jul-23 |
| Unimpeachable | Penn National,
11-May-23 |
| Unimpeached | Charles Town,
03-Dec-22 |
| UNINFORMED | |
| Uninhibited | Strathalbyn,
03-Oct-18 |
| Uninook | Belmont,
30-Nov-22 |
| Uninspired | Delta Downs,
08-Feb-25 |
| Uninsurabal | Scone,
10-Jun-25 |
| UNINTENTIONAL | Ipswich,
03-May-10 |
| Uninterrupted | Launceston,
28-Oct-20 |
| Uninvited | Goulburn,
16-Mar-12 |
| Uninvited Guest | Delaware Park,
05-Oct-25 |
| Union Alley | Naas,
03-Apr-25 |
| Union Army | Valparaiso Sporting Club,
01-May-25 |
| Union Army | Warwick Farm,
04-Dec-24 |
| Union Avenue | Cheltenham,
14-Mar-24 |
| Union Belle | Monmouth Park,
04-Aug-25 |
| UNION BELLE | |
| Union Bliss | Grants Pass,
17-Jun-23 |
| Union Branch | Mountaineer,
07-Oct-25 |
| Union Brother | Mountaineer,
14-Dec-23 |
| Union Bulldog | Colonial Downs,
04-Sep-25 |
| Union Cait | Hawthorne,
17-Oct-25 |
| Union Champ | Busan,
06-Apr-25 |
| Union City | Bunbury,
16-Jan-14 |
| Union City Blues | Gunnedah,
07-Oct-17 |
| Union Coach | Emerald Downs,
08-Sep-25 |
| Union Colonel | Fort Erie,
01-Oct-24 |
| Union Dame | Canterbury Park,
01-Sep-25 |
| Union Dance | Golden Gate Fields,
03-Jan-23 |
| Union Data | Lone Star,
14-Jun-25 |
| Union Delegate | Rockhampton,
04-Mar-25 |
| Union Dolly | Hawthorne,
03-Nov-25 |
| Union Doos | Monmouth Park,
01-Sep-25 |
| Union Dues | Ipswich,
17-May-19 |
| Union Empress | Horseshoe Indianapolis,
01-Oct-25 |
| Union Express | Belmont At The Big A,
14-Sep-25 |
| Union Flag | Musselburgh,
05-Feb-24 |