Robert Mark Nosofsky (born c. 1956) is an American psychologist.
He is a professor in the department of psychological and brain sciences at Indiana University Bloomington, who is known for his exemplar theory.
His research is in the development and testing of formal mathematical models of perceptual category learning and representation.
The exemplar theory explains how the human beings learn and use these concept categories.
In January, he accepted the editorship of the Psychonomic Bulletin & Review.