Lesnoy or Lesnoi (, "Forest" (adjective)) is a Russian masculine surname. Its feminine counterpart is Lesnaya.
It may refer to: Aleksandr Lesnoy (born 1988), Russian shot putter Sergey Paramonov (entomologist) (1894–1967), Ukrainian-Australian entomologist who used the pseudonym Sergey Lesnoy Vladyslava Lesnaya (born 1996), Ukrainian badminton player