Hello how may I help you? I am wondering about tallest person on earth is, who is it? Do you want tallest person today or tallest person of all time? both The tallest person of all time was Robert Wadlow. Tallest person today is Saltan Kosen wow, how tall was he? Saltan Kosen is 8'3" tall. Robert Wadlow was 8'11" tall wow, that is tall. Thank you ! You are welcome. Need anything else? Did this tallest person have a wife? No wife/ No, thank you