Dennis Owen Mathews (February 21, 1901 - 197?) was an English army officer, artist, cartographer, and travel-industry businessman active in the early to middle 20th century. Mathews was born in London and educated at Latymer School, London and Varndean School, Brighton. He joined the Royal Air Force in 1818, towards the end of World War I. After the war he was assigned to the Uganda Survey Department, Royal Engineers, where he served from 1921 to 1946. In 1948 he became the General Manager of the East African Tourist Travel Association, a position which he held until 1963. He was the United Nations Tourism Expert in 1965 and the Director of Tourism of the Seychelles from 1965 to 1966. Later he became the General Manager of Downey and Selby Safaris from 1967 to 1970. During his service as General Manager of the East African Tourist Travel Association, he drew and published several pictorial maps of different parts of East Africa. His works includes maps of Kenya, Tanzania, Uganda, Gedi, and Kampala. He was a Fellow of the Royal Geographical Society, was recognized in 1959 as an Officer of the Most Excellent Order of the British Empire (OBE), and in 1965 as a Knight of the Most Distinguished Order of Saint Michael and Saint George. He was also an avid big game hunter. In the world of cartography, Mathews is significant as one of the few pictorial cartographers to produce maps focused on African topics.