Thomas Annandale, FRCS FRSE (1838–1907) was a Scottish surgeon who conducted the first repair of the meniscus, the first successful removal of an acoustic neuroma and introduced the pre-peritoneal approach to inguinal hernia repair. He served as Regius Professor of Clinical Surgery at the University of Edinburgh.
Born in Newcastle-upon-Tyne on 2 February 1838, he was third son of Thomas Annandale, surgeon, by his wife Elizabeth Johnston. He was educated at Bruce's Academy in Newcastle, and then apprenticed to his father. Continuing medical studies at Newcastle Infirmary, he matriculated in 1856 at Edinburgh University Medical School, and graduated M.D. in 1860 with the highest honours, receiving the gold medal for his thesis On the Injuries and Diseases of the Hip Joint.
Annandale was appointed in 1860 house-surgeon to James Syme at the Edinburgh Royal Infirmary, and was Syme's private assistant from 1861 to 1870. In 1863 he was admitted Fellow of the Royal College of Surgeons of Edinburgh, and became a junior demonstrator of anatomy in the university under John Goodsir. He was also appointed in 1863 a lecturer on the principles of surgery in the extramural school of medicine, and gave there a course of lectures yearly until 1871, when he began to lecture on clinical surgery at the Royal Infirmary. Annandale was admitted a member of the Royal College of Surgeons of England, on 15 July 1859, and Fellow on 12 April 1888; in 1864 he won the Jacksonian prize for his dissertation on The malformations, diseases and injuries of the fingers and toes, with their surgical treatment (Edinburgh 1865).