Hello how may I help you? Hi who is the tallest person in the world? Do you mean currently living or of all time? Both please Robert Wadlow the tallest man in history he was 8 feet 11 Wow! Sultan Kosen is the tallest man alive today he is 8 foot 3 Thats awesome! thanks for the info! Would you like to hear more about Robert Wadlow? Sure quick facts only please im short on time He was 22 when he died due to complications from an infection. He was still growing when he died WOW!