Thomas Bevill Peacock (21 December 1812 – 31 May 1882) was a cardiologist in London remembered for founding the London Chest Hospital. He also made a large contribution to the understanding of aortic dissection by publishing several case series on the condition.
Peacock was the son of Thomas Peacock and his wife Sarah Bevill, who belonged to the Society of Friends; he was born at York on 21 December 1812. At the age of nine he was sent to the boarding-school of Samuel Marshall at Kendal. He was then apprenticed to John Fothergill, a medical practitioner at Darlington.
In 1833 Peacock went to London as a medical student at University College, also attending the surgical practice of St George's Hospital; and in 1835 he became a member of the College of Surgeons and a licentiate of the Society of Apothecaries. He then travelled for his health, twice visiting Ceylon, and studying for a time at Paris. He spent 1838 as house-surgeon to the hospital at Chester, and in 1841 went to the University of Edinburgh Medical School, where in 1842 he took the degree of M.D.
In 1844 Peacock was admitted a licentiate of the Royal College of Physicians of London, and in 1849 was elected assistant physician to St. Thomas's Hospital. In 1850 he was elected a fellow of the College of Physicians, and in 1865 delivered the Croonian lectures there on Some of the Causes and Effects of Valvular Disease of the Heart. A dispensary which he began in Liverpool Street, London, ultimately grew into the Victoria Park Hospital for diseases of the chest, to which he was physician from its foundation. He lectured at St. Thomas's Hospital, and was one of the founders of the Pathological Society of London in 1846, and a contributor to its Transactions. He was its secretary in 1850, vice-president 1852–6, and president in 1865 and 1866.