William Walter Menninger (born October 23, 1931), known by his peers as "Dr. Walt", is an American psychiatrist in the third generation of the Menninger family, which has run the Menninger Foundation since 1925. He served as dean of the Karl Menninger School of Psychiatry and Mental Health Science and he was the CEO of the Menninger Clinic from the 1993 to 2001. During his tenure as CEO, the clinic began negotiations to move from Topeka, Kansas, to Houston, Texas, where it is affiliated with Baylor College of Medicine.