The Linton Worm is a mythical beast referred to in a Scottish Borders legend dating back to the 12th century. "Wyrm" is the Old Norse for serpent. A 12th-century writer believed it to be "In length three Scots yards and bigger than an ordinary man’s leg – in form and callour to our common muir edders." The myth is similar to that of the more famous Lambton Worm.