Ronald George Wreyford Norrish (9 November 1897–7 June 1978) was a British chemist. he was awarded the Nobel Prize in Chemistry in 1967 along with Manfred Eigen and George Porter for their study of extremely fast chemical reactions. One of his accomplishments is the development of the Norrish reaction.

He became the Head of the Physical Chemistry Department at Cambridge, occupying part of the Lensfield Road Building with the separate department 'Chemistry'. One of his accomplishments is the development of the Norrish reaction.