Walter Davy Cowan, D.D.S., (December 31, 1865 – September 28, 1934) was a Canadian politician in Saskatchewan and Ku Klux Klan member. Cowan served as Mayor of Regina and served as Conservative-Unionist Member of Parliament for Regina from 1917 to 1921 and then as the Conservative MP for Long Lake from 1930 until his death. A dentist by profession, Cowan was born in Guelph, Canada West, to Scottish immigrants. After his early schooling in Guelph, Cowan attended the University of Maryland, graduating with a degree in dentistry in 1888.