Isinglass, (foaled 1890), racehorse (Thoroughbred) who won the British Triple Crown in 1893 and earned a then record for a British horse of more than $235,000 (record broken in 1952) during his racing career.
Sired by Isonomy and foaled by Dead Lock, he was owned by H. McCalmont and trained by J. Jewitt. After winning three races in 1893, as a two-year-old, ridden by Tom Loates, he won the Two Thousand Guineas, the Derby, and the Saint Leger, comprising the British Triple Crown. He also won the Newmarket Stakes. In 1894 he won the Eclipse Stakes at Sandown, and in 1895, as a five-year-old, he won the Ascot Gold Cup.