David McKenzie Rioch (July 6, 1900 – September 11, 1985) was a psychiatric research scientist and neuroanatomist, known as a pioneer in brain research and for leading the interdisciplinary neuropsychiatry division at the Walter Reed Army Institute of Research (1951–1970), a program that contributed to the formation of the then-nascent field of neuroscience. W. Maxwell Cowan, Donald H. Harter, and Eric R. Kandel cited "the seminal roles played by David McKenzie Rioch, Francis O. Schmitt, and ... Stephen W. Kuffler in creating neuroscience as we now know it."