Alekseev
The taxon authority Alekseev, Alexeev, Aléxéieff or Алексеев may refer to:
- Aleksey Karpovich Alekseev (1881–1938), Russian (Soviet) paleontologist
- Alexander Sergeevich Alekseev (born 1947), Russian paleontologist
- Alexey Georgievitch Aléxéieff (1882–1950, A.G.Alexeieff), Russian (Soviet) protozoologist and botanist
- Anatoly Vladimirovich Alexeev (1924–2013), Russian entomologist and palaeontologist
- Evgenii Borisovich Alexeev (1946–1987, E.B.Alexeev), Russian (Soviet) botanist
- Evgeny Vasilievich Alekseev (born 1934), Russian entomologist, also published as Evgeny Vasilievich Alexeev
- Pavel Igorevich Alexeev (born 1983, P.I.Alexeev), Russian palaeobotanist
- Sergei Konstantinovich Alekseev (born 1954), Russian (Soviet) entomologist
- Vitalii Igorevich Alekseev (born 1978), Russian entomologist and paleontologist
- Yuriy Evgenievich Alexeev (born 1934, Yu.E.Alexeev), Russian (Soviet) botanist