Bethmann is a German surname. Notable people with the surname include:
The Bethmann family in Germany, originally from Goslar, achieved greatest prominence in Frankfurt am Main; the Bethmann-Hollweg sideline produced a German chancellor.
Konrad Bethmann (1625–1701), Münzwardein and Münzmeister in Nassau and other German placesJohann Philipp Bethmann (1715–1793), grandson of Konrad Bethmann, merchant and banker in Frankfurt am MainJohann Jakob Bethmann (1717–1792), grandson of Konrad Bethmann, merchant, shipowner and consul in BordeauxSimon Moritz Bethmann (1721–1782), grandson of Konrad Bethmann, merchant and banker in Frankfurt am MainSimon Moritz von Bethmann (1768–1826), son of Johann Philipp Bethmann (1715–1793), banker and statesman in Frankfurt am MainMoritz von Bethmann (1811–1877), son of Simon Moritz von Bethmann, banker and merchant in Frankfurt am MainLudwig Simon Moritz Freiherr von Bethmann (1844–1902), son of Moritz von Bethmann, banker in Frankfurt am MainMoritz Henning August Freiherr von Bethmann (1887-1966), son of Ludwig Simon Moritz Freiherr von Bethmann, banker in Frankfurt am MainJohann Philipp von Bethmann (1924–2007), son of Moritz Henning August Freiherr von Bethmann, banker and book author in Frankfurt am MainAugust von Bethmann-Hollweg (1795–1877), grandson of Johann Philipp Bethmann (1715–1793), Prussian jurist and politicianTheobald von Bethmann Hollweg (1856–1921), grandson of August von Bethmann-Hollweg, German politicianAlexandre de Bethmann (1805-1871), mayor of Bordeaux from 1867 to 1870, great-grandson of Johann Jakob BethmannPierre de Bethmann (1961-), French jazz pianist, 5th-generation descendant of Alexandre de BethmannHeinrich Eduard Bethmann (1774–1857), German actor and theater directorLudwig Konrad Bethmann (1812–1867), German historianErich Waldemar Bethmann (1904-1993), Author and religious scholarSabine Bethmann (b. 25 October 1931), former German movie actressAndreas Bethmann (19??-), German film director