White Moonstone (foaled 25 February 2008) is an American-bred, British-trained Thoroughbred racehorse and broodmare. In a racing career which lasted from July until October 2010 she was undefeated in four races of increasing importance. After winning a maiden race on her debut she won the Group Three Sweet Solera Stakes, the Group Two May Hill Stakes and the Group One Fillies' Mile. She suffered training problems in the early part of the following year and was retired without racing again. She has produced at least one foal.