- John William Strutt [struht] /strʌt/, 3rd Baron,1842–1919, English physicist: Nobel prize 1904.
- Lord, title of John William Strutt, 1842–1919, British physicist. He discovered argon (1894) with Ramsay and made important contributions to the theory of sound, the theory of scattering of radiation, etc. Nobel prize for physics 1904
- British physicist whose investigation of the densities of gases led to his discovery (with Sir William Ramsay) of the noble gas argon in 1894. For this work he won the 1904 Nobel Prize for physics.