Magic Weisner (foaled in Maryland on May 3, 1999) was an American Thoroughbred racehorse. A descendant of Bold Forbes, he was sired by Ameri Valay and bred by Nancy H. Alberts. Magic Weisner was a graded stakes winner but is best remembered for his runner-up finish in the 2002 Preakness Stakes and his serious public battle to overcome the West Nile Virus when little was known about the disease.