OLVIDADA f. 1911
DINNA FORGET (IRE) - MAGUEY (GB), by SIMONTAULT (---)

OLYMPIA (USA) c. 1946
HELIOPOLIS (GB) - MISS DOLPHIN (BRZ), by STIMULUS (USA)

OLYMPIA DELL (USA) f. 1953
OLYMPIA (USA) - , by

OLYMPIC DRESS (BRZ) f. 2004
PUBLIC PURSE (USA) - INFORMAL DRESS (BRZ), by CLACKSON (BRZ)

OMAR KHAYYAN (GB) c. 1914
MARCO (GB) - , by

OMAYYA (USA) f. 1931
SIR GALLAHAD (FR) - OMMIAD (USA), by

OMBROSETTA (BRZ) f. 1999
CHOCTAW RIDGE (USA) - JUNGLE FILLY (BRZ), by KIGRANDI (BRZ)

OMEGA BIS () f. 0000
- , by

OMEYAD f. 1988
BARONIUS (BRZ) - ADRIANINA (BRZ), by FELICIO (FR)

OMIRI f. 1988
ITAJARA (BRZ) - MENDOZA (BRZ), by ALIPIO (FR)