Martin Neil Rossor (born 24 April 1950) is a British clinical neurologist with a specialty interest in degenerative dementias and familial disease.

He is professor emeritus and principal research associate at the UCL Queen Square Institute of Neurology, honorary consultant neurologist at the National Hospital for Neurology and Neurosurgery, and was the national director for Dementia Research for the National Institute for Health Research (NIHR) in the UK.

He was the editor of the Journal of Neurology, Neurosurgery, and Psychiatry, president of the Association of British Neurologists, director of the NIHR Clinical Research Network for Dementia and Neurodegenerative Diseases, and director of the NIHR Queen Square Dementia Biomedical Research Unit.

[1][2] His collaborative work in identifying and characterising a large collection of familial cases of Alzheimer’s disease contributed to the discovery of mutations in the amyloid precursor protein gene.

He holds a Bachelor of Medicine/ Bachelor of Surgery (1974); Master of Arts (1975); is a Member of the Royal College of Physicians (1976); Doctor of Medicine (1986); and Fellow of the Royal College of Physicians (1990).