Unrivaled Belle (foaled 2006) is a gray/roan American Thoroughbred racehorse owned and bred in Kentucky by Gary Seidler & Peter Vegso.
She is a daughter of champion sire and champion racehorse Unbridled's Song, a descendant of the very influential sire Mr. Prospector, out of the Grade II winner Queenie Belle (Bertrando).
She won the 2010 Breeders' Cup Ladies Classic over favorite Blind Luck, who finished 2nd.
Unrivaled Belle was retired from racing in June 2011, minutes before the running of the Ogden Phipps Handicap.
[1] As of 2016, she has produced two fillies: Meseika (2013) by Megdalio d'Oro, and multiple stakes-winner Unique Bella (2014) by Tapit.