Christopher Donald Frith FRS, FMedSci, FBA, FAAAS (born 16 March 1942) is a British psychologist and professor emeritus at the Wellcome Centre for Neuroimaging at University College London.

He then completed a Diploma in Abnormal Psychology and a PhD[7] at the Institute of Psychiatry, London, under the supervision of Hans Eysenck.

[9] He is the author of The Cognitive Neuropsychology of Schizophrenia (1992), revised and re-issued (2015),[10] which won the British Psychological Society Book Award[11] in 1996.

In 1975 Frith joined an MRC research group at Northwick Park Hospital, dedicated to exploring the biological basis of schizophrenia.

[20] In the 1990s, at the MRC Cyclotron Unit, Hammersmith Hospital, Frith was among the first to apply functional neuroimaging (PET and fMRI) to the study of cognitive processes.

[22] Here he explored the neural basis of cognitive abilities including voluntary action,[23] consciousness,[24] and Theory of Mind.

Frith and these colleagues demonstrated, experimentally, some of the mechanisms of advantageous group decision making and the emergence of mutual behavioural adaptation in simple joint action.