Otto Wonderly (c. 1878 - April 2, 1905) was a Canadian Thoroughbred horse racing jockey from Ontario who competed in his native Canada and in the United States where he died from a racetrack accident. Before embarking on a riding career, Wonderly worked as a newsboy for the Grand Trunk Railway. He was riding at a track in Windsor, Ontario when some prominent Canadian horsemen recognized his natural talent and arranged for him to go to the United States. There, he was placed under contract by James Ben Ali Haggin, one of America's preeminent horsemen and owner of the renowned Elmendorf Farm in Lexington, Kentucky. Haggin paid Wonderly $15,000 for second call on his services for eight months. He would later ride for a Chicago based stable and as well would ride in the United States and Canad