Alekseev
The taxon authority Alekseev may refer to: (or Alexeev (another spelling of the same name))
- Aleksey Karpovich Alekseev (1881-1938), Russian paleontologist
- Alexander Sergeevich Alekseev, Russian paleontologist
- Evgenii Borisovich Alexeev (1946–1987), Russian botanist
- Evgeny Vasilievich Alekseev (born 1934), Russian entomologist, also published as Evgeny Vasilievich Alexeev
- Sergei Konstantinovich Alekseev (born 1954), Russian entomologist
- Vitalii Igorevich Alekseev (1978–), Russian entomologist and paleontologist
- Yuriy Evgenievich Alexeev (born 1934; Yu.E.Alexeev), botanist