Castle Downs is a residential area in the northwest portion of the City of Edmonton in Alberta, Canada. The area was originally to be called Athabasca Downs, but when the city rejected the name, the developer used their second choice: Castle Downs. The names of the communities were based on European castles, and Castle Downs became the first area in Edmonton to be named in a thematic way. According to former Names Committee secretary Nancy Diettrich “The castles were chosen to recognize the different ethnic groups in the area.” It was originally established in 1971 through Edmonton City Council's adoption of the Castle Downs Outline Plan, and then extended northward in 1983 through the adoption of the Caste Downs Extension Area Structure Plan. Combined, these two plans guide the overall development of the area.

Edmonton is the capital city of the Canadian province of Alberta. Edmonton is situated on the North Saskatchewan River and is the centre of the Edmonton Metropolitan Region, which is surrounded by Alberta's central region. The city anchors the northern end of what Statistics Canada defines as the "Calgary–Edmonton Corridor", a region spanning between Edmonton and the city of Calgary, Alberta’s largest city, which includes the many smaller municipalities between the two.