David Blyth Hanna (December 20, 1858, Thornliebank, Scotland – December 1, 1938, Toronto) was a railway executive with the Canadian Northern Railway and the Canadian National Railways. Born in Thornliebank, Scotland, he emigrated to Canada in 1882 where he was employed by the Grand Trunk Railway. In 1896 he joined William Mackenzie and Donald Mann who organized the Canadian Northern Railway (CNoR) in Western Canada. The town of Hanna, Alberta is named after him.