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English: Arthur Max Barrett, MD (28 July 1909 – 11 December 1961), also known as Dr. A. M. Barrett, was an university morbid anatomist and histologist at the University of Cambridge, and an honorary consulting pathologist to the United Cambridge Hospitals and to the East Anglian Regional Hospital Board. He wrote numerous works, often cited in medical literature. He is known today for the Barrett Room at Addenbrooke's Hospital named in his honour. He is also known to be the father of Syd Barrett, who was the founding member of the band Pink Floyd and pioneering singer-songwriter.