Haynesfield (foaled May 12, 2006, in New York) is an American Thoroughbred racehorse.
Bred by Barry Weisbord and Margaret Santulli, Haynesfield was purchased for $20,000 at the Keeneland April two-year-olds in training sale.
He is sired by Speightstown, the American Champion Sprint Horse (2004), who had career earnings of $1,258,256 and capped off his career with a win in the Breeders' Cup Sprint.
Haynesfield burst onto the racing spotlight when he won 4 straight races from October 2008 to February 2009.
Haynesfield won the Empire Classic at Belmont Park on 22 October 2011 for the second time, the first being in 2009.