Robert Strutt, 4th Baron Rayleigh
| The Lord Rayleigh | |
|---|---|
| Rayleigh in 1934 | |
| Born | 28 August 1875 Essex, England | 
| Died | 13 December 1947 (aged 72) | 
| Nationality | British | 
| Education | Eton College | 
| Alma mater | Trinity College, Cambridge | 
| Known for | Rayleigh Rayleigh scattering | 
| Spouses | Lady Mary Hilda Clements  (m. 1905; died 1919) Kathleen Alice Coppin-Straker  (m. 1920) | 
| Children | 6 | 
| Awards | Bakerian Medal (1911, 1919) FRS (1905) | 
| Scientific career | |
| Fields | Experimental physics Chemical physics | 
| Institutions | Imperial College London | 
Robert John Strutt, 4th Baron Rayleigh FRS (28 August 1875 – 13 December 1947) was a British peer and physicist. He discovered "active nitrogen" and was the first to distinguish the glow of the night sky.