Achton Friis (5 September 1871 – 17 December 1939) was a Danish illustrator, painter and writer. He participated in the Denmark Expedition to Northeast Greenland in 1906–1908, creating a large number of works in the process, both landscape paintings and portraits, as well as a written account which was published in 1909. He later published several comprehensive and richly illustrated works with descriptions of the nature and cultural history of different parts of Denmark. In addition, he designed decorative works for the Bing & Grøndahl porcelain manufacturer.