Hello how may I help you? Who is the tallest person in the world? To clarify, do you want the tallest living person currently? Or of all time? The tallest living person. Sultan Kosen is the tallest living person in the world How tall is he? He is measured at 8 foot 3 Who is the tallest person of all time? Robert Wadlow is the tallest person of all time How tall was he? He was measured at 8 foot 11, almost 9 feet tall! Woah! Thank you!