Hello how may I help you? I have a question about World Records. What do you want to know? I would like to know how tall the tallest person of all time is/ ? or was. Robert Wadlow. How tall is Robert Wadlow? He was 8'11". Okay! Thank you. You are welcome. Anything else? Nope, I got the answers I needed, thank you, have a good day Glad I could help. Goodbye.