Nikolai Vladimirovich Dahl, often called Nicolai Dahl () (July 17, 1860 – 1939) was a Russian Empire physician.
nˈɪkəlˌaɪ vlˌædɪmɪɹˈoʊvɪtʃ dˈɑːl, ˈɔfən kˈɔːld nˈɪkəlˌaɪ dˈɑːl dʒuːlˈaɪ sˈɛvəntˌiːn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi nˈaɪn wʌzɐ ɹˈʌʃən ˈɛmpaɪɚ fɪzˈɪʃən.