Logician (foaled 29 March 2016) is a British Thoroughbred racehorse. He was unraced as a two-year-old in 2018 but in the following year he established himself as a top-class performer as he won all five of his races including the Great Voltigeur Stakes and the St Leger Stakes. He recovered from a life-threatening bout of peritonitis in December 2019 and won one minor race before sustaining his first defeat in the Cumberland Lodge Stakes.