David Blain (August 12, 1832 – May 6, 1909) was a Scottish-born Canadian lawyer, teacher and political figure. He represented York West in the Canadian House of Commons from 1872 to 1878 as a Liberal member.He was born near Ayr, the son of John Blain and Elizabeth McCutcheon, and came to Canada West with his parents in 1842. He was educated in Scotland and at the University of Toronto. Blain was called to the bar in 1860 and set up practice in Toronto, partnering for a time with Albert Prince.