bˈɔːɹɪs mˌɪkheɪlˈoʊvɪtʃ hˈɛsən, ˈɔːlsoʊ dʒˈɛsən sˈɪkstiːn ˈɔːɡəst wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd nˈaɪnti θɹˈiː, ᵻlˈɪsɐvˌɛtɡɹæd twˈɛnti dᵻsˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi sˈɪks, mˈɑːskoʊ,  wʌzɐ sˈoʊviət fˈɪzɪsˌɪst, fɪlˈɑːsəfɚɹ ænd hɪstˈoːɹiən ʌv sˈaɪəns.
Boris Mikhailovich Hessen (), also Gessen (16 August 1893, Elisavetgrad – 20 December 1936, Moscow),  was a Soviet physicist, philosopher and historian of science.