Rupert Kenneth Furneaux (29 June 1908 – 1981) was a British writer who wrote many books on mysteries, murder trials and true crime.

[1] He spent seven years investigating the mystery of Oak Island and published his conclusions in 1972.

[2] His book on the eruption of Krakatoa received a favourable review from Eric Shipton.

[3] Furneaux researched cases of true crime and his books on criminology were well received by academics.

[4][5] His research on Guenther Podola was described as a "fascinating reading and is a valuable addition to the studies of those criminal cases in which important psychiatric problems have been raised.