'''Sir Harold Jeffreys''', [[Fellow of the Royal Society|FRS]]<ref name="frs">{{Cite journal | last1 = Cook|first1 = A.|author-link = Alan Cook|doi = 10.1098/rsbm.1990.0034|title = Sir Harold Jeffreys. 2 April 1891–18 March 1989|journal = [[Biographical Memoirs of Fellows of the Royal Society]]|volume = 36|pages = 302–326|year = 1990|doi-access = free}}</ref><ref name="frs2">{{Cite journal|doi = 10.1098/rsbm.1991.0025|title = Errata: Sir Harold Jeffreys. 2 April 1891–18 March 1989|journal = [[Biographical Memoirs of Fellows of the Royal Society]]|volume = 37|page = 491|year = 1991|doi-access = free}}</ref> ([[22. april]] [[1891]] – [[18. marts]] [[1989]]) var en britisk [[matematiker]], statistiker, [[geofysik]]er og [[astronom]]. Hans bog, ''Theory of Probability'', der blev udgivet første gang i 1939, spuillede en vigtig rolle i genoplivningen af [[Bayesiansk sandsynlighed|objektiv Bayesiansk syn på sandsynlighed]].<ref name = "jaynes">{{cite book |first=E. T. |last=Jaynes |title=Probability Theory: The Logic of Science |publisher=Cambridge University Press |year=2003 |isbn=0-521-59271-2 }}</ref><ref name="mactutor">{{MacTutor Biography|id=Jeffreys}}</ref><ref>{{cite journal | last1 = Robert | first1 = C.P. | last2 = Chopin | first2 = N. | last3 = Rousseau | first3 = J. | year = 2009 | title = Harold Jeffreys's Theory of Probability Revisited | journal = Statistical Science | volume = 24 | issue = 2| pages = 141–172 | doi = 10.1214/09-STS284 | doi-access = free }}</ref>
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