John Russell, 4th Earl Russell

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Photo: John Conrad Russell and his mother Dora Black

John Conrad Russell, 4th Earl Russell (16 November 1921 - 16 December 1987) was the eldest son of the philosopher and mathematician Bertrand Russell (the 3rd Earl) and his second wife, Dora Black. Thus, the 4th Earl was the great-grandson of the 19th century British Whig Prime Minister Lord John Russell.

Married on 28 August 1946 to Susan Doniphan Lindsay, he had only two daughters, Lady Sarah Elizabeth Russell, born on 16 January 1946, and Lady Lucy Catherine Russell (21 July 1948 - 11 April 1975), neither of whom married or bore children.[citation needed]

The 4th Earl was succeeded by his half-brother, the historian Conrad Russell, who became the 5th Earl Russell.