Archibald McKellar MacMechan FRSC (June 21, 1862 – 7 August 1933) was a Canadian academic at Dalhousie University and writer.

His works deal mainly with Nova Scotia and its history.

Born in Berlin, Ontario (now known as Kitchener), he is credited with reviving Herman Melville's reputation in North America.

[2] He was awarded the Lorne Pierce Medal in 1932.

He was a long-term member of the Royal Nova Scotia Historical Society.