Hello how may I help you? I'd like to know who the tallest person in the world is Sure! Do you mean the tallest living person or the tallest person of all time? Ever The tallest living person ever was Robert Pershing Wadlow. He was 8 ft 11.1 inches tall. Who is the tallest living person Sultan Kosen. He is 8 feet tall. Do you have anymore questions for me? Ok thanks Your welcome! Bye If you are finished please end session. Thank you!