John Samuel Greene Blair (31 December 1928 — 12 June 2023) was a Scottish surgeon, chiefly at Perth Royal Infirmary.

[3][5] Having studied history as an external student at London University, he was awarded the degree of Bachelor of Arts in 1955.

[5] For several years he served in the Territorial Army, commanding the St Andrews (later Tayforth) Officer Training Corps and then 225 Field Ambulance in Dundee.

[1] As a reservist officer until 1992, Blair held posts in Cyprus, Hong Kong, Musgrove Park, and Nepal, He was awarded the Territorial Decoration (TD) for this military service.

[5] Blair retired from the NHS in 1991 and took up an appointment as honorary senior clinical teacher at the Faculty of Medicine, University of Dundee.

[1] In recognition of his many contributions as a serving officer and historian to the Royal Army Medical Corps, he was elected Life President of the Friends of Millbank.