Will to power is a term which according to Nietzsche refers to the basic human need to become stronger, more complete, more superior. While satisfying the "Will to power", a person continually becomes something other than he or she was.

Will to survive is a term which according to Schopenhauer refers to the powerful need to perpetuate one's life by satisfying one's biological needs.

Will West Case refers to the identification case that placed fingerprint technology above that of anthropometrics

William Glasser refers to the founder of Reality therapy and spoke to the importance of the relationship in counseling.

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- William Harvey (1578–1657) : William Harvey refers to a British physician born in 1578. His work published in 1628 entitled "An Anatomical Study of the Motion of the Heart and of the Blood in Animals", first explained how blood was pumped from the heart throughout the body, then returned to the heart.

- William McDougall (1871 - 1938) : William McDougall pursued a type of behaviorism very different from Watson's. McDougall's behaviorism emphasized purposive and instinctive behavior. Please see also Hormic psychology.

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William of Occam (ca. 1285- 1349) early Psychologist who denied the contention of the realists that what people experience are but manifestations of abstract principles. William of Occam sided with the Nominalists, instead who said that so-called abstract principles, or universals, were nothing more than verbal labels that people use to describe classes of experiences. For William of Occam, there is no need to assume a "higher" reality beyond our senses, reality is what we experience directly

- Williams syndrome (WS) : Williams syndrome (WS) refers to a neurodevelopmental disorder characterized by a recognizable pattern of dysmorphic facial features, cardiovascular and physical abnormalities, mental retardation, a specific cognitive profile, and a distinct personality. It is a disorder that produces severe mental retardation but leaves language functions relatively intact. Moreover, it is a type of mental retardation (low IQ) in which the person has relatively good language skills in spite of extremely limited abilities in other regards