Leonard King or Len King may refer to:

• Leonard William King (1869–1919), English archaeologist and Assyriologist
• Len King (1925–2011), South Australian politician, lawyer and judge
• Len King (cricket umpire) (born 1941), Australian cricket umpire
• Leonard King (basketball) (born 1966), American and New Zealand basketball player
• Leonard King (drummer), American jazz drummer who played on several albums with James Carter in the mid-2000s

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