Arthur Max Barrett, MD (28 July 1909 – 11 December 1961), also known as Dr. A. M. Barrett, was a 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 , often cited in medical literature. The Barrett Room at Addenbrooke's Hospital is named in his honour, as is a Prize for the undergraduate Part II Pathology Tripos at the University of Cambridge. He was the father of Syd Barrett, a founding member of the band Pink Floyd.