Peter Berners Fellgett FRS, FIEE (11 April 1922 – 15 November 2008) was a British physicist.
He is best known for Fellgett's advantage: the improvement of the signal-to-noise ratio by using multiplex measurements, i.e. simultaneous measurement at different wavelengths, such as Fourier transform spectroscopy.
[1] From Cambridge he moved to the Royal Observatory Edinburgh where he continued his interests in instrument science.
In 1964, he moved to the University of Reading where he became professor of Cybernetics and Instrument Physics.
While at Reading he was involved on research in Ambisonics (with Michael Gerzon), as well as continuing his interest in instrumentation.