Douglas Strachan (26 May 1875, Aberdeen, Scotland – 20 November 1950) is considered the most significant Scottish designer of stained glass windows in the 20th century.

He is best known for his windows at the Peace Palace in The Hague, Netherlands, at Edinburgh's Scottish National War Memorial and in cathedrals and churches throughout the United Kingdom.

Strachan, and his brother Alexander, who was hired as the technical instructor of stained glass, opened a stained-glass studio-workshop in Edinburgh.

The added stress of working on his own stained glass commissions while teaching and acting as department head led Strachan to resign his position at the school in 1911.

[6] Strachan died in Pittendreich House in Lasswade, Midlothian, and is buried in the central section of the 20th century extension to Dean Cemetery in Edinburgh.

His largest commission was to design the windows for the Scottish National War Memorial in Edinburgh Castle in the late 1920s.