Wool Winder (5 April 1904–28 November 1928), also known as Woolwinder, was a British-bred and raced Thoroughbred racehorse that won the 1907 St. Leger Stakes. Wool Winder excelled as a three-year-old but suffered from health problems in his later career, running rarely in 1908 and 1909. Sold and exported to Austria-Hungary in 1909, he became a successful sire of winners in the 1910s and 1920s before his death of an intestinal infection in 1928.