mˈɑːɹk ˌɑːsɪpˈoʊvɪtʃ ɹˌiːˈaɪzən, ˈɔːlsoʊ ɹˈaɪzən ɔːɹ ɹˈeɪzən,  noʊvˈɛmbɚ twˈɛnti fˈaɪv, nˈaɪntiːnhˈʌndɹɪd nˈaɪnti tˈuː, pˈaʊ, wʌzɐ lˈiːdɪŋ sˈoʊviət ˈɑːpɚɹə bˈæsoʊ sˈɪŋɚ.
Mark Osipovich Reizen, also Reisen or Reyzen (,  – November 25, 1992), PAU, was a leading Soviet opera basso singer.