Vagin or Vaguine () is a Russian masculine surname originating from the word vaga meaning lazy person, its feminine counterpart is Vagina. The surname may refer to the following notable people:
Merkury Vagin (died 1712), Russian Arctic explorer Vladimir Vagin (illustrator), Soviet and American illustrator Vladimir Vagin (footballer) (born 1982), Russian football player
References Ganzhina, I. M. (2001) Словарь современных русских фамилий. Moscow: Astrel. p. 90. .