 Robert Strutt, 4th Baron Rayleigh

Robert Strutt, 4th Baron Rayleigh (1875–1947) was a British physicist and a peer. He was the son of the 3rd Baron Rayleigh, John William Strutt, who was a renowned physicist awarded the Nobel Prize in Physics in 1904. Robert himself continued the family tradition of engagement in scientific research and was also known for his work in the field of optics.