Klas Fleming

Klas Fleming may refer to:


 * Klaus Fleming (Clas Eriksson Fleming 1535–1597), Finnish-Swedish admiral
 * Klaus Hermansson Fleming (c. 1550–1616), Swedish soldier and historian
 * Klaus Hermansson Fleming (official) (1649–1685), Governor of Örebro (1680–1681)
 * Claes Adolph Fleming (1771–1831), Swedish count and member of the Swedish Academy
 * Clas Larsson Fleming (1592–1644), admiral and administrator of the Royal Swedish Navy
 * HSwMS Clas Fleming, a Swedish Navy mine cruiser