Henri Paul Hyacinthe Wallon (March 15, 1879 – December 1, 1962) was a French philosopher, psychologist (in the field of social psychology), neuropsychiatrist, teacher, and politician.

Following his education, he occupied the highest positions in the French university world where he fostered leading research activity.

Wallon was admitted to the École Normale Supérieure in 1899, where he passed higher-level competitive examinations for teachers and professors (agrégation) in philosophy in 1902.

Émile Jalley showed how Henri Wallon was an attentive reader of the German scientific and philosophical literature and how he contributed to the introduction and diffusion of certain concepts of Hegel and Freud into French psychological theory.

In this regard, Wallon differed from Jean Piaget, who in his own description of the stages of infantile development instead valorized interactions to the detriment of discontinuity.

In turn, certain psychoanalysts adapted his observations, in particular René Spitz, Donald Winnicott, and Jacques Lacan, the latter of whom highlighted the focus on "social relativity in...Wallon's remarkable work".