Prof John Glaister FRSE PRCPSG FCS LRCPE LRCSE DPH LLD (9 March 1856 – 18 December 1932) was a Scottish forensic scientist who worked as a general practitioner, police surgeon, and as a lecturer at Glasgow Royal Infirmary Medical School and the University of Glasgow. Glasgow University's Glaister Prize is named in his honour.
Glaister was born in Lanark on 9 March 1856 the son of Joseph Glaister and his wife, Marion Hamilton Weir. He attended the Lanark Grammar School. In 1873, he enrolled to the Faculty of Medicine of Glasgow University. After graduating, he became a police surgeon and a general practitioner in Townhead. In 1881, he was appointed a lecturer in Medical Jurisprudence at the Glasgow Royal Infirmary Medical School, and in 1887 a Special Lecturer in Public Health.
In 1888 he was promoted to Professor of Forensic Medicine and Public Health, which post he held until 1931, being succeeded by his son and namesake.
In 1898 he was elected a Fellow of the Royal Society of Edinburgh. His proposers were John Gray McKendrick, William Jack, Frederick Orpen Bower and James Thomson Bottomley. At this time he had consulting rooms at 71 North St Mungo Street in Glasgow.
In 1902, he published his most famous work, A Textbook of Medical Jurisprudence, Toxicology and Public Health. He was also noted as an expert witness in widely publicised legal cases such as the trial of Oscar Slater in 1909.
He died at 3 Newton Place in Glasgow on 17 December 1932.