Franz Boas (/ˈfrɑːnz ˈboʊ.æz/; July 9, 1858 – December 21, 1942) was a German-American anthropologist and a pioneer of modern anthropology who has been called the "Father of American Anthropology" and "the Father of Modern Anthropology." Like many such pioneers, he trained in other disciplines; he received his doctorate in physics, and did post-doctoral work in geography. He applied the scientific method to the study of human cultures and societies; previously this discipline was based on the formulation of grand theories around anecdotal knowledge.

Boas once summed up his approach to anthropology and folklore by saying: "In the course of time I became convinced that a materialistic point of view, for a physicist a very real one, was untenable. This gave me a new point of view and I recognized the importance of studying the interaction between the organic and inorganic, above all the relation between the life of a people and their physical environment."

Franz Uri Boas was born in Minden, Westphalia. Although his grandparents were observant Jews, his parents embraced Enlightenment values, including their assimilation into modern German society. Boas’s parents were educated, well-to-do, and liberal; they did not like dogma of any kind. Due to this, Boas was granted the independence to think for himself and pursue his own interests. Early in life he displayed a penchant for both nature and natural sciences. Boas vocally opposed anti-Semitism and refused to convert to Christianity, he did not identify himself as a Jew; indeed, according to his biographer, "He was an 'ethnic' German, preserving and promoting German culture and values in America." In an autobiographical sketch, Boas wrote: