Leonard Johnson or Len Johnson may refer to:

• Leonard Johnson (defensive back, born 1990), American football player in the US
• Leonard Johnson (defensive back, born 1998), American football player in the US and Canada
• Len Johnson (American football) (born 1946), American football center

• Leonard Johnson (baseball), American baseball player
• Len Johnson (boxer) (1902–1974), professional boxer of the 1920s and 1930s
• Len Johnson (cricketer) (1919–1977), Australian cricketer
• Len Johnson (footballer) (1908–1942), Australian rules footballer

• Leonard V. Johnson, Canadian politician
• Leonard G. Johnson (born 1953), American inventor and entrepreneur

• Ernest Leonard Johnson (died c. 1977), South African astronomer