| Name | Sex | Colour | Registration | Foaling Date | Reg Status | Competition Status |
|---|---|---|---|---|---|---|
| THE WITCH | Mare | BLACK | 48124 | 01/11/1971 | Stud Book | Deceased |
| THE WOLF OF WALL STREET | Stallion | BAY | 234304 | 16/09/2012 | Stud Book | Deceased |
| THEAK | Gelding | CHESTNUT | 63450 | 01/01/1979 | Stud Book | Not Eligible |
| THEANNA | Mare | BAY/BROWN | F15868 | 05/11/1978 | Foal Recorded | Not Eligible |
| THEEANDA SANDMAN | Gelding | CHESTNUT | 52489 | Stud Book | Not Eligible | |
| THEEANDER COOL LADDIE | Gelding | CHESTNUT | 65872 | 14/02/1980 | Stud Book | Not Eligible |
| THEEANDER LEE ANN | Mare | BAY | 65870 | 13/12/1979 | Stud Book | Not Eligible |
| THEEANDER PROMISE | Mare | GREY | 65871 | 08/02/1974 | Stud Book | Not Eligible |
| THEEANDER RENOUN | Gelding | DUN | 65869 | 10/11/1980 | Stud Book | Not Eligible |
| THEEANDER RETREAT | Mare | CHESTNUT | 65873 | 09/12/1978 | Stud Book | Not Eligible |
| THEEANDER TINA | Mare | BROWN | 57695 | 12/10/1974 | Stud Book | Not Eligible |
| THEEROY - HSH | Stallion | BAY | 8225 | 01/12/1957 | Stud Book | Deceased |
| THEEROYS GIFT | Mare | CHESTNUT | 41957 | 09/11/1974 | Stud Book | Deceased |
| THEGLEN ASH - HSH | Mare | BLACK | 194445 | 01/09/1995 | Stud Book | Not Eligible |
| THEGLEN IGNITE - HSH | Mare | BLACK | 238957 | 14/10/2011 | Stud Book | Not Eligible |
| THEGLEN OCTAVIA | Mare | BAY | C1-195239 | 01/08/1995 | First Cross | Not Eligible |
| THELANS RAMBLER | Gelding | BROWN | 65941 | 12/12/1977 | Stud Book | Not Eligible |
| THELESE | Mare | GREY | 16659 | Stud Book | Deceased | |
| THELLY - HSH | Mare | CHESTNUT | 24614 | 01/08/1961 | Stud Book | Deceased |
| THELMA | Mare | BAY | 4915 | Stud Book | Deceased | |
| THELMAS WISH | Mare | BROWN | BP-78487 | 12/11/1990 | Breeding Purposes Only - Stud Book | Not Eligible |
| THELYS HOPE | Mare | BROWN | 3429 | 01/01/1968 | Stud Book | Deceased |
| THEME - HSH | Mare | BROWN | 8238 | 16/09/1954 | Stud Book | Deceased |
| THEMEADOWS JETSTAR | Gelding | BAY | C2-198961 | 30/10/2010 | Second Cross | Eligible |
| THEMEADOWS LIZZYSTAR - HSH | Mare | BROWN/BLACK | 259281 | 11/11/2017 | Stud Book | Eligible |
| THEMEADOWS OAKSTAR | Gelding | CHESTNUT | C2-235538 | 21/09/2012 | Second Cross | Eligible |
| THEMEDA BLUE KNIGHT | Stallion | GREY | F26099 | 01/10/1980 | Foal Recorded | Not Eligible |
| THEO | Gelding | BROWN | 11074 | Stud Book | Deceased | |
| THEO TONIC - HSH | Stallion | CHESTNUT | 229072 | 15/11/2011 | Stud Book | Not Eligible |
| THEOAKS ROCKIN ROBIN | Mare | BAY | C1-269376 | 31/10/2013 | First Cross | Eligible |
| THEODORE | Gelding | BROWN | 50027 | 12/09/1974 | Stud Book | Not Eligible |
| THEODORE PARK DITTO | Mare | BAY | F22578 | 22/11/1979 | Foal Recorded | Not Eligible |
| THEODORE PARK TRUMBY | Stallion | BAY | F26889 | 15/11/1980 | Foal Recorded | Not Eligible |
| THEORY | Gelding | BAY | 48273 | 20/08/1976 | Stud Book | Deceased |
| THEOS MARSHAL - HSH | Gelding | CHESTNUT | 260461 | 30/10/2019 | Stud Book | Not Eligible |
| THERE LIKE | Mare | BROWN | 15738 | 01/01/1967 | Stud Book | Deceased |
| THERESA | Mare | BROWN | 24373 | Stud Book | Not Eligible | |
| THERESA ANNE | Mare | CHESTNUT | 55938 | 11/11/1972 | Stud Book | Not Eligible |
| THERESA CREEK AIDA | Mare | BAY | C1-165231 | 20/12/1997 | First Cross | Not Eligible |
| THERESA CREEK CHAMPAGNE | Mare | BAY | 144020 | 18/08/1999 | Stud Book | Not Eligible |
| THERESA CREEK DOT | Mare | BAY | 156084 | 30/08/2000 | Stud Book | Not Eligible |
| THERESA CREEK KELLIE | Mare | BROWN | 144018 | 12/09/1998 | Stud Book | Not Eligible |
| THERESA CREEK SCHOONER | Gelding | BAY | 117852 | 16/01/1992 | Stud Book | Not Eligible |
| THERESA FOX | Mare | BAY | 2359 | Stud Book | Deceased | |
| THERESA PARK MAJESTICALLY - HSH | Mare | BROWN | 157636 | 03/10/2001 | Stud Book | Not Eligible |
| THERESAPARK MATILDA - HSH | Mare | BROWN | 197731 | 03/10/2003 | Stud Book | Not Eligible |
| THERINA - HSH | Mare | CHESTNUT | 21208 | 12/12/1967 | Stud Book | Deceased |
| THERINGA | Mare | BAY | 39488 | Stud Book | Not Eligible | |
| THERIVERS ABBEAVER DECK | Gelding | BAY | 149785 | 17/10/1998 | Stud Book | Not Eligible |
| THERIVERS CELINE | Mare | GREY | 185507 | 14/10/1999 | Stud Book | Eligible |
| THERIVERS ROBIN HOOD | Gelding | BAY | 163110 | 14/10/1998 | Stud Book | Not Eligible |
| THERIVERS SATIN | Mare | GREY | C2-149787 | 16/12/1997 | Second Cross | Not Eligible |
| THERIVERS SCARLIGHT | Mare | GREY | SM-153711 | 10/11/2000 | Special Merit - Stud Book | Not Eligible |
| THERIVERS SUMMER ROY | Gelding | GREY | C2-153712 | 15/12/2000 | Second Cross | Not Eligible |
| THERRIBRI EL DIABLO | Gelding | BAY | 57243 | Stud Book | Not Eligible | |
| THERWOOD GOLDIE | Mare | CHESTNUT | 25528 | Stud Book | Not Eligible | |
| THERWOOD SHILOAH | Mare | GREY | 72409 | 03/09/1980 | Stud Book | Not Eligible |
| THERWOOD TABATHA | Mare | CHESTNUT | 25529 | Stud Book | Not Eligible | |
| THERWOOD TABERNELLA | Mare | CHESTNUT | 30569 | 13/10/1974 | Stud Book | Not Eligible |
| THERWOOD TIFFANY BELLE | Mare | DUN | 19204 | Stud Book | Deceased | |
| THEWATTLES MISS EMMA - HSH | Mare | BAY | 115039 | 29/09/1994 | Stud Book | Not Eligible |
| THING | Gelding | BAY | 19952 | Stud Book | Deceased | |
| THIRD TIME COOL | Gelding | CHESTNUT | C1-166103 | 15/08/2001 | First Cross | Not Eligible |
| THIRLESTONE TIFFANY | Mare | GREY | 5426 | 01/01/1967 | Stud Book | Deceased |
| THIRLMERE BARLOCH | Gelding | CHESTNUT | 49753 | 07/10/1976 | Stud Book | Not Eligible |
| THIRLMERE TAMMY | Mare | CHESTNUT | F18941 | 30/10/1978 | Foal Recorded | Not Eligible |
| THIRLSTONE ALABASTER | Gelding | CHESTNUT | 56672 | 09/11/1977 | Stud Book | Deceased |
| THIRLSTONE ANOTHER DAWN | Mare | BROWN/GREY | 64985 | 02/04/1981 | Stud Book | Not Eligible |
| THIRLSTONE CHANCE SPOT | Mare | BROWN | 59217 | 17/12/1977 | Stud Book | Deceased |
| THIRLSTONE COLLEEN | Mare | BROWN | 21993 | 01/08/1972 | Stud Book | Deceased |
| THIRLSTONE DAYLIGHT | Mare | CHESTNUT | 21999 | Stud Book | Deceased | |
| THIRLSTONE FIDGET | Mare | BAY | 22004 | Stud Book | Deceased | |
| THIRLSTONE FREDA | Mare | BROWN | 22008 | Stud Book | Deceased | |
| THIRLSTONE GANA SPOT | Mare | BROWN | 43228 | 10/10/1975 | Stud Book | Not Eligible |
| THIRLSTONE GAY SPOT | Mare | BAY | 43835 | 10/09/1976 | Stud Book | Not Eligible |
| THIRLSTONE HAIL SPOT | Mare | BAY | 43834 | 16/09/1975 | Stud Book | Not Eligible |
| THIRLSTONE JET SPOT | Mare | BAY | 56673 | 17/11/1977 | Stud Book | Not Eligible |
| THIRLSTONE JEWEL BOX | Mare | BROWN | 21991 | Stud Book | Deceased | |
| THIRLSTONE JUST GOLD | Mare | CHESTNUT | 22007 | Stud Book | Deceased | |
| THIRLSTONE LIGHT SPOT | Gelding | CHESTNUT | 59219 | 20/10/1977 | Stud Book | Not Eligible |
| THIRLSTONE MAGNET | Mare | CHESTNUT | 21998 | Stud Book | Deceased | |
| THIRLSTONE MELISSA | Mare | BLACK | 21996 | Stud Book | Deceased | |
| THIRLSTONE MIDNIGHT | Mare | BLACK | 21995 | Stud Book | Deceased | |
| THIRLSTONE MORNING STAR | Mare | BAY | 56674 | 13/01/1977 | Stud Book | Deceased |
| THIRLSTONE QUICK CAT | Mare | DUN | 21994 | Stud Book | Deceased | |
| THIRLSTONE SCHEVAL | Mare | BROWN | 3093 | 10/02/1966 | Stud Book | Deceased |
| THIRLSTONE SHARZAN | Mare | CHESTNUT | 65389 | 05/01/1982 | Stud Book | Not Eligible |
| THIRLSTONE SMOKEY SPOT | Mare | BROWN | 43229 | 30/08/1976 | Stud Book | Deceased |
| THIRLSTONE SOUTHERN BELLE | Mare | CHESTNUT | 59218 | 18/10/1979 | Stud Book | Deceased |
| THIRLSTONE SUSIE | Mare | CHESTNUT | 21997 | Stud Book | Deceased | |
| THIRLSTONE TRY HIGH | Mare | BAY | 62136 | 20/09/1977 | Stud Book | Not Eligible |
| THIRLSTONE VALDICE | Mare | GREY | 22001 | 25/02/1968 | Stud Book | Deceased |
| THIRLSTONE VALETA | Mare | BAY | 22003 | Stud Book | Deceased | |
| THIRSTLEDOON BARNABY | Gelding | BAY | 67626 | 01/08/1981 | Stud Book | Not Eligible |
| THIRSTY LEO | Gelding | CHESTNUT | 63984 | 27/09/1981 | Stud Book | Not Eligible |
| THIRSTY MERC | Gelding | BLACK | 270704 | 14/11/2022 | Stud Book | Eligible |
| THIS CATS TIPSY | Mare | CHESTNUT | C1-259949 | 24/10/2019 | First Cross | Eligible |
| THIS DOCS FLASH | Mare | BAY/PIED | C1-259306 | 12/09/2020 | First Cross | Not Eligible |
| THIS TRAMPS LETHAL | Mare | BAY | C1-268105 | 02/12/2017 | First Cross | Eligible |
| THISBE | Mare | CHESTNUT | 19308 | Stud Book | Deceased |