Walter Traill Dennison (1825–1894) was a farmer and folklorist. He was a native of the Orkney island of Sanday, in Scotland, United Kingdom, where he collected local folk tales and other antiquites. Dennison recorded most of the information available about traditional tales told on Orkney but to an extent "romanticised and systematised" parts of it in the process of transforming the stories into prose. He published the folk stories, many in the local Orcadian dialect, in 1880 under the title The Orcadian Sketch-Book (William Peace & Son, Kirkwall). Also author of the ten Sanday Revival Hymns (published anonymously, 1861, Edinburgh).