One and Three Chairs, 1965, is a work by Joseph Kosuth. An example of conceptual art, the piece consists of a chair, a photograph of the chair, and an enlarged dictionary definition of the word "chair". The photograph depicts the chair as it is actually installed in the room, and thus the work changes each time it is installed in a new venue.

Joseph Kosuth is an American conceptual artist, who lives in New York and London, after having resided in various cities in Europe, including Ghent and Rome.