Kvashnin (masculine) or Kvashnina (feminine) is a Russian surname.
This surname is shared by the following people:
Anatoly Kvashnin (1946–2022), Chief of the Russian General Staff from 1997 to 2004 and Hero of the Russian Federation Konstantin Kvashnin (1898–1982), Soviet Russian football player and manager Yuri Kvashnin (born 1964), Soviet Russian pair skater