Gregory Bateson (9 May 1904 – 4 July 1980) was an English anthropologist, social scientist, linguist, visual anthropologist, semiotician, and cyberneticist whose work intersected that of many other fields. His writings include Steps to an Ecology of Mind (1972) and Mind and Nature (1979).

In Palo Alto, California, Bateson and his colleagues developed the double-bind theory of schizophrenia.

Bateson's interest in systems theory forms a thread running through his work. He was one of the original members of the core group of the Macy conferences in Cybernetics (1941–1960), and the later set on Group Processes (1954–1960), where he represented the social and behavioral sciences. He was interested in the relationship of these fields to epistemology. His association with the editor and author Stewart Brand helped widen his influence.

Bateson was born in Grantchester in Cambridgeshire, England, on 9 May 1904. He was the third and youngest son of (Caroline) Beatrice Durham and the distinguished geneticist William Bateson. He was named Gregory after Gregor Mendel, the Austrian monk who founded the modern science of genetics.

The younger Bateson attended Charterhouse School from 1917 to 1921, obtained a Bachelor of Arts in biology at St. John's College, Cambridge, in 1925, and continued at Cambridge from 1927 to 1929.

According to Lipset (1982), Bateson's life was greatly affected by the death of his two brothers. John Bateson (1898–1918), the eldest of the three, was killed in World War I. Martin Bateson (1900–1922), the second brother, was then expected to follow in his father's footsteps as a scientist, but came into conflict with his father over his ambition to become a poet and playwright. The resulting stress, combined with a disappointment in love, resulted in Martin's public suicide by gunshot under the statue of Anteros in Piccadilly Circus on 22 April 1922, which was John's birthday. After this event, which transformed a private family tragedy into a public scandal, the parents' ambitious expectations fell on Gregory.

In 1928, Bateson lectured in linguistics at the University of Sydney. From 1931 to 1937, he was a Fellow of St. John's College, Cambridge. He spent the years before World War II in the South Pacific in New Guinea and Bali doing anthropology.

In the 1940s, he helped extend systems theory and cybernetics to the social and behavioral sciences. Although initially reluctant to join the intelligence services, Bateson served in the OSS during World War II along with dozens of other anthropologists. He was stationed in the same offices as Julia Child (then Julia McWilliams), Paul Cushing Child, and others. He spent much of the war designing 'black propaganda' radio broadcasts. He was deployed on covert operations in Burma and Thailand, and worked in China, India, and Ceylon as well. Bateson used his theory of schismogenesis to help foster discord among enemy fighters. He was upset by his wartime experience and disagreed with his wife over whether science should be applied to social planning or used only to foster understanding rather than action.