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