Conrad Sebastian Robert Russell, 5th Earl Russell, (15 April 1937 – 14 October 2004), was a British historian and politician. His parents were the philosopher and mathematician Bertrand Russell and his third wife Patricia Russell. He was also a great-grandson of the 19th century British Whig Prime Minister Lord John Russell. He succeeded to the earldom on the death of his half-brother, John Russell, on 16 December 1987. Both sons were named after their father's great friend Joseph Conrad, who was also the 4th Earl's godfather.