Thomas Edward Knowles Stansfield, CBE (1862 – 19 February 1939) was a British pathologist of mental illnesses and medical officer. The son of a leather merchant from Todmorden, Stansfield trained in Medicine at the University of Edinburgh and graduated (MB) in 1889 with an interest in pathology. Shortly afterwards he took up a junior position at London County Council's Banstead Asylum, where he set about improving working practices and establishing a laboratory. He rose quickly through the ranks, and was appointed Senior Assistant Medical Officer at the new Claybury Asylum in 1893. Five years later, he was transferred to Bexley Mental Hospital as Superintendent, serving there until he retired in 1921.