Norbert Elias (German: [ˈnɔʁbɛʁt eˈliːas]; 22 June 1897 – 1 August 1990) was a German sociologist who later became a British citizen. He is especially famous for his theory of civilizing/decivilizing processes.

Elias was born on 22 June 1897 in Breslau (today: Wrocław) in Prussia's Silesia Province to Hermann Elias (1860–1940) and Sophie Elias, née Gallewski (also Galewski, 1875–1942). His father was a native of Kempen (today: Kępno) and a businessman in the textile industry. His mother was a native of the Jewish community of Breslau itself.

After passing the abitur in 1915, Norbert Elias volunteered for the German army in World War I and was employed as a telegrapher, first at the Eastern front, then at the Western front. After suffering a nervous breakdown in 1917, he was declared unfit for service and was posted to Breslau as a medical orderly.

The same year, Elias began studying philosophy, psychology and medicine at the University of Breslau, in addition spending a term each at the universities of Heidelberg (where he attended lectures by Karl Jaspers) and Freiburg in 1919 and 1920. He quit medicine in 1919 after passing the preliminary examination (Physikum). To finance his studies after his father's fortune had been reduced by hyperinflation, in 1922 Elias took up a job as the head of the export department in a local hardware factory. In 1924, he graduated with a doctoral dissertation in philosophy entitled Idee und Individuum (Idea and Individual) supervised by Richard Hönigswald, a representative of neo-Kantianism. Disappointed about the absence of the social aspect from neo-Kantianism, which had led to a serious dispute with his supervisor about his dissertation, Elias decided to turn to sociology for his further studies.

During his Breslau years, until 1925, Elias was deeply involved in the German Zionist movement, and acted as one of the leading intellectuals within the German-Jewish youth movement "Blau-Weiss" (Blue-White). During these years he got acquainted with other young Zionists like Erich Fromm, Leo Strauss, Leo Löwenthal and Gershom Scholem. In 1925, Elias moved to Heidelberg, where Alfred Weber accepted him as a candidate for a habilitation (second book project) on the development of modern science, entitled Die Bedeutung der Florentiner Gesellschaft und Kultur für die Entstehung der Wissenschaft (The Significance of Florentine Society and Culture for the Development of Science). In 1930 Elias chose to cancel this project and followed Karl Mannheim to become his assistant at the University of Frankfurt. However, after the Nazi take-over in early 1933, Mannheim's sociological institute was forced to close. The already submitted habilitation thesis entitled Der höfische Mensch ("The Man of the Court") was never formally accepted and not published until 1969 in a much elaborated form as "Die höfische Gesellschaft" ("The Court Society").

In 1933, Elias fled to Paris. His elderly parents remained in Breslau, where his father died in 1940; on 30 August 1942 his mother was deported to Theresienstadt, and on 29 September transferred to and murdered in Treblinka. During his two years in Paris, Elias worked as a private scholar supported by a scholarship from the Amsterdam Steunfonds (Prof. Frijda's benefit fund) and tried to gain some additional income by organizing a workshop for the production of wooden children's toys. In 1935, he moved on to Great Britain, where he worked on his magnum opus, The Civilizing Process, until 1939, now supported by a scholarship from a relief organization for Jewish refugees. In this work, he described the Nazi's genocide of the Jews as a "decivilizing spurt" of a civilization suffering from decay and a regression to barbarism. This work also contain's Elias' body theory. Drawing from historical documents describing manners and etiquette, he identified the processes that facilitated the emergence of the modern self within a civilized body. Elias equated the term "civilized" with the "controlled" body.

In 1939, he met up with his former friend and supervisor Mannheim at the London School of Economics, where he obtained a position as senior research assistant. In 1940, the LSE was evacuated to Cambridge, but when an invasion of Britain by German forces appeared imminent, Elias was detained at internment camps in Liverpool and on the Isle of Man for eight months, on account of his being German – an "enemy alien". During his internment he organized political lectures and staged a drama he had written himself, Die Ballade vom armen Jakob (The Ballad of Poor Jacob) with a musical score by Hans Gál (eventually published in 1987).

Upon his release in 1941, he returned to Cambridge. Towards the end of the war, he worked for British intelligence, investigating hardened Nazis among German prisoners of war (see his essay "The breakdown of civilisation", in Studies on the Germans). He taught evening classes for the Workers' Educational Association (the adult education organization), and later evening extension courses in sociology, psychology, economics and economic history at the University of Leicester. He also held occasional lectureships at other institutions of higher learning. In collaboration with a friend from Frankfurt days, the psychoanalyst S. H. Foulkes, he laid the theoretical foundations of Group Analysis, an important school of therapy, and co-founded the Group Analytic Society in 1952. He himself trained and worked as a group therapist. On Febr. 22, 1952 he was naturalized as a British citizen.