Hello how may I help you? Who is the world's tallest man? Billy Smith is the worlds tallest man. Do you need to know how tall he is? How tall is he? Billy Smith is 8'11" tall. But the Guinness Book of World Records states that Sultan Ksen is the tallest man in the world. That is not the current information. Where does Billy Smith live? Hooterville New York Okay thanks You're welcome