Queen of Trumps (1832–1843) was a British thoroughbred racehorse and broodmare best known for winning the classic Oaks and St Leger Stakes in 1835, becoming the first horse to win both races. In a racing career which lasted from October 1834 until October 1836 she won ten of her eleven races. After being successful in her only race as a two-year-old, she defeated the 1000 Guineas winner Preserve in the Oaks on her three-year-old debut. Later that year she started favourite for the St Leger and won from a field which included Preserve and The Derby winner Mundig. Queen of Trumps sustained her only defeat a few days later when she was attacked by a dog in the closing stages of the Scarborough Stakes. She was retired to stud after winning all four of her races in 1836. Queen of Trumps died in