Sir Harold Jeffreys, FRS () iku sawijining matématikawan, ahli statistik, ahli géofisika, lan astronom.

Dhèwèké dilairaké ing Fatfield, Washington, County Durham, Inggris. Dhèwèké sinau ing Armstrong College ing Newcastle upon Tyne, wektu iku bagéan saka Universitas Durham, sarta ing Universitas London External Programme. Dhèwèké banjur mulang ing St John's College, Cambridge lan dadi fellow nalika taun 1914. Ing Universitas Cambridge dhèwèké mulang matématika, géofisika lan akiré dadi Plumian Professor of Astronomy.

Saka taun 1939 tekan taun 1952, dhèwèké njabat minangka Dirèktur ing Ringkesan Seismologi Internasional, luwih ditepungi minangka Pusat Seismologi Internasional.

Jeffreys panentang keras téyori pagèsèran bawana. Kanggo dhèwèké, pagèsèran bawana iku kadadéan sing "ora mungkin dumadi" (out of question), amarga ora tinemu bukti anané gaya sing cukup kuwat sing bisa ngobahaké bawana-bawana ing lumahing bumi.

Bebungah 
 Fellow, Royal Society, 1925
 Adams Prize, 1927 (Constitution of the Earth)
 Gold Medal, Royal Astronomical Society, 1937
 Buchan Prize, Royal Meteorological Society, 1929
 Murchison Medal of Geological Society (Great Britain) 1939
 Victoria Medal, Royal Geographical Society, 1941
 LaGrange Prize, Brussels Academy, 1948
 Royal Medal, 1948
 William Bowie Medal, American Geophysical Union, 1952
 Knighted, 1953
 Copley Medal, Royal Society, 1961

Cathetan

Réferènsi 

 David Howie, "Interpreting Probability: Controversies and Developments in the Early Twentieth Century" (Cambridge University Press, 2002)
 Maria Carla Galavotti. "Harold Jeffreys' Probabilistic Epistemology: Between Logicism And Subjectivism". British Journal for the Philosophy of Science, 54(1):43-57 (March 2003). (A review of Jeffreys' approach to probability; includes remarks on R.A. Fisher, Frank P. Ramsey, and Bruno de Finetti. Also online: )
 Bertha Swirles, Reminiscences and Discoveries: Harold Jeffreys from 1891 to 1940, Notes and Records of the Royal Society of London, Vol. 46, No. 2, pp. 301–308 (1992).

Pranala njaba 
 Foto Harold Jeffreys di Arsip Visual Emilio Segrè: .
 
 Biografi Pemenang Vetlesen Prize - Sir Harold Jeffreys 
 Harold Jeffreys, sebagai seorang ahli statistik
 

Ahli astronomi Inggris
Matematikawan Inggris
Lair 1891