William Albert Denis Galloway (5 March 1878 – 7 May 1957), better known as Denis Galloway, was a Scottish ethnographic artist and photographer. The elder son of Sir William Galloway (1840–1927), Mining Professor at University College of Wales in Cardiff, and Christiana Maud Mary Gordon (1853–1880). His younger brother was Christian Francis John Galloway (1880–1969). Galloway was a renowned ethonographic artist and photographer who travelled extensively in Europe, whilst living firstly in Zealand and later in Romania, recording the customs and costumes of the local people, from about 1914 until he returned to England in 1950.
Galloway was born in Cardiff, where his father was a mining engineer. He was educated at home with his brother and later attained his BSc in Mining Engineering at the University of Wales.
Galloway joined the Royal Monmouthshire Royal Engineers, being appointed a 2nd Lieutenant on 10 March 1897, a Lieutenant on 7 December 1898, a Captain on 6 June 1903. He then resigned his commission on 30 April 1907. In 1901 his occupation was Artist Lieutenant in the Royal Monmouthshire Royal Engineers.
In 1904, at the age of 26, Galloway joined the Slade School of Fine Arts in London.
In 1914 Galloway settled in Westkapelle, Netherlands. While living there, he joined Jan Tooroop's artist group in Domburg. He spent the next ten years painting, etching, sketching and photographing the village, the dike, the people and their traditional way of life. Following the destruction of the area in the bombing of October 1944, Galloway's work became an invaluable record of life in the pre-war era, and, as such, has been kept by the Polderhuis (Dyke and Polder War Museum of Westkapelle). Examples of Galloway's work are also held in the Royal Archives of Queen Juliana of the Netherlands.