Anthony Giddens, Baron Giddens (born 8 January 1938) is a British sociologist who is known for his theory of structuration and his holistic view of modern societies. He is considered to be one of the most prominent modern sociologists, the author of at least 34 books, published in at least 29 languages, issuing on average more than one book every year. In 2007, Giddens was listed as the fifth most-referenced author of books in the humanities.

Three notable stages can be identified in his academic life. The first one involved outlining a new vision of what sociology is, presenting a theoretical and methodological understanding of that field, based on a critical reinterpretation of the classics. His major publications of that era include Capitalism and Modern Social Theory (1971) and New Rules of Sociological Method (1976). In the second stage Giddens developed the theory of structuration, an analysis of agency and structure, in which primacy is granted to neither. His works of that period, such as Central Problems in Social Theory (1979) and The Constitution of Society (1984), brought him international fame on the sociological arena.