OVERPOWERING f. 1967
BOLD RULER (USA) - HIGH VOLTAGE (USA), by AMBIORIX (FR)

OVERPRAISED (BRZ) f. 1976
RAISE A NATIVE (USA) - OVERPOWERING (USA), by BOLD RULER (USA)

OVERSIGHT f. 1988
BARONIUS (BRZ) - FASHION DANCER (USA), by DANCER'S IMAGE (USA)

OVERTURE (GB) f. 1937
DASTUR (GB) - , by

OWEN TUDOR (GB) c. 1938
HYPERION (GB) - MARY TUDOR (FR), by PHAROS (GB)

OZANAM (BRZ) c. 1988
ITAJARA (BRZ) - GOLD STERN (BRZ), by KARABAS (GB)

P. J. EXTRAVAGANZA (USA) f. 1987
STOP THE MUSIC (BRZ) - PAULA J. T. (USA), by L'ENJOLEUR (CAN)

P.PETER () c. 0000
- , by

P.T. INDY c. 1994
A.P. INDY (USA) - RELUCTANT GUEST (USA), by HOSTAGE (USA)

P.T.BOAT () f. 0000
- , by