David Elieser Deutsch, FRS is a British physicist at the University of Oxford. He is a Visiting Professor in the Department of Atomic and Laser Physics at the Centre for Quantum Computation (CQC) in the Clarendon Laboratory of the University of Oxford.

Deutsch pioneered the field of quantum computation by formulating a description for a quantum Turing machine, as well as specifying an algorithm designed to run on a quantum computer. He is a proponent of the many-worlds interpretation of quantum mechanics.

He was awarded the Dirac Medal and Prize of the International Centre for Theoretical Physics in 2017, the Isaac Newton Medal and Prize of the Institute of Physics in 2021, and the Breakthrough Prize in Fundamental Physics in 2022. His popular books The Fabric of Reality and The Beginning of Infinity have each been translated into 12 languages.