Valentin Lvovich Bianchi (Russian: Валенти́н Льво́вич Биа́нки; 18 February 1857 – 10 January 1920) was a Russian ornithologist. He is honoured in the common and scientific names of Bianchi's warbler (Seicercus valentini), described by Ernst Hartert. Bianchi was the Head of the Department of Ornithology at the Imperial Academy of Sciences from 1896 to 1920. He worked mainly on birds from Middle and Central Asia. An active member of the Russian Geographical Society, he took part in its major enterprises such as the Toll Expedition (1900) and the Kamchatka Expedition of 1908.