| Name | Sex | Colour | Registration | Foaling Date | Reg Status | Competition Status |
|---|---|---|---|---|---|---|
| ZENONIE REGRET | Mare | BAY | 22838 | 01/02/1968 | Stud Book | Deceased |
| ZENONIE SABRINA | Mare | GREY | 22835 | Stud Book | Deceased | |
| ZENONIE SWEET NEART | Mare | BAY | 22836 | Stud Book | Deceased | |
| ZENORE | Mare | CHESTNUT | 100149 | 01/01/1986 | Stud Book | Deceased |
| ZEPHER - HSH | Mare | BROWN | F34271 | 02/08/1982 | Foal Recorded | Deceased |
| ZEPHYR | Mare | BROWN | 34119 | 26/01/1975 | Stud Book | Not Eligible |
| ZEPHYR ARABELLA - HSH | Mare | BAY | 188491 | 18/08/2006 | Stud Book | Not Eligible |
| ZEPHYR MAEVE | Mare | BROWN | BP-78651 | 28/09/1988 | Breeding Purposes Only - Stud Book | Not Eligible |
| ZEPHYR ZINE | Mare | BROWN | 115692 | 01/11/1991 | Stud Book | Not Eligible |
| ZEPHYR ZULU - HSH | Gelding | BLACK | 171043 | 26/09/2003 | Stud Book | Not Eligible |
| ZERA | Mare | BAY | F37868 | 05/03/1984 | Foal Recorded | Not Eligible |
| ZERED | Mare | BROWN | 40480 | 24/10/1975 | Stud Book | Not Eligible |
| ZERENITE DELTAS MAGIC - HSH | Mare | BROWN/BLACK | 231509 | 01/09/2012 | Stud Book | Eligible |
| ZERENITE FLASH | Gelding | BROWN | 255737 | 07/09/2020 | Stud Book | Eligible |
| ZERENITE LUNAR STAR | Mare | BROWN | B2-195880 | 14/09/2004 | Breeding Purposes Only - Second Cross | Not Eligible |
| ZERENITE MAYBELLINE - HSH | Mare | CHESTNUT | 238345 | 28/11/2013 | Stud Book | Eligible |
| ZERENITE MISS DAISY | Mare | BROWN | C2-255736 | 24/09/2020 | Second Cross | Eligible |
| ZERENITE PHANTOM OAK | Stallion | BAY/BROWN | 195881 | 10/09/2010 | Stud Book | Eligible |
| ZERENITE STAR ILLUSION - HSH | Mare | BAY | 231510 | 03/10/2012 | Stud Book | Not Eligible |
| ZERENITE VIRTUE | Gelding | BROWN | 197609 | 01/03/2008 | Stud Book | Eligible |
| ZERENITE WAGONWHEEL | Gelding | BROWN | C2-250493 | 13/11/2018 | Second Cross | Eligible |
| ZERO | Gelding | BROWN | 25183 | Stud Book | Not Eligible | |
| ZERO FROST | Gelding | CHESTNUT | C2-187733 | 19/09/2005 | Second Cross | Not Eligible |
| ZEST | Mare | BROWN | 73252 | 17/04/1985 | Stud Book | Not Eligible |
| ZETA BANORANA LASS | Mare | CHESTNUT/TAFFY | 59895 | 01/01/1972 | Stud Book | Deceased |
| ZETA BERNADETTE | Mare | CHESTNUT | 59896 | 01/01/1969 | Stud Book | Deceased |
| ZETA GEORGES CHOICE | Mare | BROWN/ROAN | 59891 | 01/01/1977 | Stud Book | Not Eligible |
| ZETA GUN SMOKE | Mare | BAY | 59892 | 01/01/1975 | Stud Book | Not Eligible |
| ZETA LADY DANZARA | Mare | BROWN | 59899 | 01/01/1975 | Stud Book | Not Eligible |
| ZETA LADY GRAYS CHOICE | Mare | GREY | 59894 | 01/01/1977 | Stud Book | Not Eligible |
| ZETA NEWS BOY | Stallion | CHESTNUT | 61428 | 01/01/1977 | Stud Book | Not Eligible |
| ZETA SECRET | Mare | BAY | 59893 | 01/01/1970 | Stud Book | Deceased |
| ZETA SUN RISE | Mare | GREY | 59897 | 01/01/1973 | Stud Book | Not Eligible |
| ZETA SUN SET | Mare | CHESTNUT/ROAN | 59898 | 01/01/1976 | Stud Book | Not Eligible |
| ZETTA | Mare | GREY | 26621 | 31/08/1974 | Stud Book | Not Eligible |
| ZEUS | Gelding | BLACK/GREY | F29970 | 17/10/1981 | Foal Recorded | Not Eligible |
| ZEUS SHADOW | Stallion | BAY | R-267750 | 25/12/2023 | Base Registry | Eligible |
| ZEYA | Mare | BROWN | 131328 | 21/10/1995 | Stud Book | Not Eligible |
| ZEYN LASS | Mare | CHESTNUT | 57825 | Stud Book | Not Eligible | |
| ZEYPHR EDITION | Gelding | CHESTNUT | 73357 | 01/12/1981 | Stud Book | Not Eligible |
| ZEZMAR | Mare | GREY | 2242 | Stud Book | Deceased | |
| ZHAV OF LEAWOOD - HSH | Gelding | PALOMINO | 46279 | 11/10/1971 | Stud Book | Deceased |
| ZHIVAGO | Gelding | BROWN/BLACK | 72247 | 15/09/1976 | Stud Book | Not Eligible |
| ZHIVAGOS HOSTESS - HSH | Mare | BAY | 65864 | 01/04/1978 | Stud Book | Not Eligible |
| ZIEGFELD FOLLIE | Mare | BAY/BROWN | C1-157859 | 27/11/1992 | First Cross | Not Eligible |
| ZIG ZAG | Mare | BAY | 8985 | Stud Book | Deceased | |
| ZIG ZAG OAK | Gelding | CHESTNUT | C2-189923 | 02/09/1997 | Second Cross | Not Eligible |
| ZIGGY | Mare | BROWN | C1-149030 | 14/11/1994 | First Cross | Eligible |
| ZIGGY DANCER | Gelding | BAY/BLACK | C1-138873 | 23/09/1995 | First Cross | Not Eligible |
| ZIGGY STARDUST | Mare | GREY | 58407 | 04/08/1976 | Stud Book | Not Eligible |
| ZILCAS BRAVO | Gelding | BAY | C1-241184 | 13/12/2015 | First Cross | Deceased |
| ZILCAS CHIEF | Gelding | CHESTNUT | 244015 | 01/11/2016 | Stud Book | Eligible |
| ZILCAS INDIANA | Mare | BAY | C1-237958 | 15/11/2014 | First Cross | Eligible |
| ZILCAS LENNY - HSH | Gelding | CHESTNUT | 244016 | 12/12/2016 | Stud Book | Eligible |
| ZILCAS MARGO | Mare | BAY | C2-248039 | 08/10/2017 | Second Cross | Eligible |
| ZILCAS PROC | Gelding | BAY | C1-248010 | 03/10/2017 | First Cross | Not Eligible |
| ZILCAS REBA - HSH | Mare | BAY | C1-241185 | 02/10/2013 | First Cross | Eligible |
| ZILZIE BLUE RAPSODY | Mare | GREY | F10214 | 01/10/1977 | Foal Recorded | Deceased |
| ZILZIE COONADOO | Mare | CHESTNUT | 14167 | 27/10/1965 | Stud Book | Deceased |
| ZILZIE PETITE | Mare | CHESTNUT | F10215 | 13/09/1977 | Foal Recorded | Deceased |
| ZIMBA | Gelding | BAY | 19173 | Stud Book | Deceased | |
| ZIMOT DESTINOAK | Gelding | CHESTNUT | 267949 | 18/11/2023 | Stud Book | Eligible |
| ZIMOT MISS N OAK | Mare | BAY | 260783 | 12/09/2010 | Stud Book | Eligible |
| ZIMOT ZELMAS DESTINY | Mare | CHESTNUT | 266095 | 07/12/2020 | Stud Book | Eligible |
| ZIND DILEE FLAMING STAR | Mare | CHESTNUT | 52235 | Stud Book | Not Eligible | |
| ZIND DILEE PLUTO | Gelding | BROWN/PIED | 54273 | Stud Book | Not Eligible | |
| ZIND DILEE STRETCH | Gelding | CHESTNUT | 54274 | Stud Book | Not Eligible | |
| ZING | Mare | CHESTNUT | C1-230239 | 02/09/2011 | First Cross | Eligible |
| ZINZI | Mare | BAY | 77576 | 15/11/1985 | Stud Book | Not Eligible |
| ZIP ALONG | Mare | BROWN | 52246 | 01/11/1973 | Stud Book | Eligible |
| ZIP DOC STRAW | Mare | CHESTNUT | 163017 | 07/09/2001 | Stud Book | Deceased |
| ZIP TIE | Gelding | BAY | 252210 | 18/09/2016 | Stud Book | Eligible |
| ZIPADEEDOODAH | Gelding | CHESTNUT | C1-241788 | 16/10/2013 | First Cross | Not Eligible |
| ZIPFS BAY LADY | Mare | BAY | 29088 | Stud Book | Not Eligible | |
| ZIPP | Mare | BROWN | 10154 | Stud Book | Deceased | |
| ZIPPADOO | Mare | CHESTNUT | 76305 | 01/01/1982 | Stud Book | Not Eligible |
| ZIPPER | Mare | BAY | 40237 | 10/12/1974 | Stud Book | Not Eligible |
| ZIPPER GIRL | Mare | BAY | 34488 | 22/09/1972 | Stud Book | Deceased |
| ZIPPER LEE - HSH | Mare | BROWN | 131313 | 20/12/1995 | Stud Book | Not Eligible |
| ZIPPY | Mare | BLACK | 213743 | 05/10/1982 | Stud Book | Deceased |
| ZIPS DOUBLE DOC | Mare | CHESTNUT | C1-231268 | 29/10/2004 | First Cross | Not Eligible |
| ZIRCON SHOOTING STAR | Stallion | BROWN/PIED | F43816 | 17/08/1987 | Foal Recorded | Not Eligible |
| ZIRLINA | Mare | CHESTNUT | 77762 | 22/10/1986 | Stud Book | Not Eligible |
| ZITA | Mare | BAY | 29585 | 01/01/1970 | Stud Book | Deceased |
| ZITA LASS | Mare | BAY | 58442 | Stud Book | Not Eligible | |
| ZOBRA MISS | Mare | BAY | 9851 | 01/09/1968 | Stud Book | Deceased |
| ZOCMAR ELEGANT EDITION - HSH | Mare | BROWN/BLACK | 149917 | 10/09/1999 | Stud Book | Not Eligible |
| ZOCMAR GLAMOUR GIRL - HSH | Mare | BROWN | 140670 | 04/11/1997 | Stud Book | Not Eligible |
| ZOCMAR PLAYBOY | Gelding | BAY/BROWN | 132082 | 29/12/1995 | Stud Book | Not Eligible |
| ZODIAC | Stallion | PALOMINO | F9843 | 01/01/1978 | Foal Recorded | Not Eligible |
| ZODIAC DREAMER | Mare | BAY | 70366 | 01/08/1977 | Stud Book | Not Eligible |
| ZODIAC MAC | Stallion | CHESTNUT | 160502 | 02/11/2001 | Stud Book | Deceased |
| ZOE | Gelding | CHESTNUT | 20171 | 03/09/1968 | Stud Book | Deceased |
| ZOE PLAUDIT | Mare | BROWN | 74860 | 01/01/1980 | Stud Book | Not Eligible |
| ZOES WONDER - HSH | Mare | BAY/BROWN | 135338 | 15/10/1998 | Stud Book | Not Eligible |
| ZOEY | Mare | BAY | 14980 | Stud Book | Deceased | |
| ZOEY MISCHIEF | Mare | CHESTNUT | 43146 | 09/10/1974 | Stud Book | Not Eligible |
| ZOLA | Mare | CHESTNUT | 53238 | Stud Book | Not Eligible | |
| ZOLA BUDD | Mare | GREY | 74563 | 06/08/1983 | Stud Book | Not Eligible |
| ZOLOTA | Mare | CHESTNUT | 76148 | 01/12/1978 | Stud Book | Not Eligible |