John Olsen was premier of South Australia, 1996–2001.

John Olsen may also refer to:

• John W. Olsen (born 1955), American archaeologist
• John Olsen (Australian artist) (1928–2023), Australian landscape and abstract artist
• John Olsen (Danish artist) (born 1938), Danish artist specializing in sculpture
• John Olsen (filmmaker) (1888–1959), Danish producer, screenwriter and studio owner
• John Olsen (footballer)
• Jack Olsen (1925–2002), American journalist and author

• John Olson (disambiguation)
• Jon Olsen (born 1969), American freestyle swimmer
• Jon Olsson (born 1982), skier

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