Sergei Nikolaevich Alphéraky (1850–1918) (sometimes Alphéraki or Alferaki) was a Russian ornithologist and entomologist who specialised in Lepidoptera. Sergei Alphéraky was born into the noble Greek family of Alferakis and was the brother of composer Achilles Alferaki. His father Nikos Alferakis owned the Alferaki Palace in Taganrog. Sergei studied at Moscow University (1867–1869), then with Otto Staudinger in Dresden (1871–1873). On his return to Russia he worked on the Lepidoptera of the Taganrog, Rostov-on-Don region. He also collected in the North Caucasus. After that he devoted himself to the insects, especially Lepidoptera, of Central Asia. He worked on the Lepidoptera collected by Nikolai Przhevalsky in Tibet held by the Zoological Museum of the Russian Academy of Science and those