Hello how may I help you? hi so i'm curious about something Sure. Ask away! who is the tallest person in the world? Do you mean the tallest living person or the tallest person of all time? how about the tallest living person The tallest living person in the world is Sultan Ksen. what about the tallest person of all time Robert Wadlow was the tallest person of all time. ok great that's all i wanted to know. thanks! You're welcome.