Hello how may I help you? i have a question I can help with that, what would you like to know about? longest thing in the world? What thing would you like to know about? longest nails I'm sorry, that request is too vague. Would you like to know about finger nails or masonry nails? finger nails The longest fingernails belong to Ayanna Williams. Her nails are 18 feet and 10.9 inches long! Are there any other records you'd like to know about? thanks! No problem, have a wonderful evening!