Robert Barr (16 September 1849 – 21 October 1912) was a Scottish-Canadian short story writer and novelist, born in Glasgow, Scotland.
Barr emigrated with his parents to Upper Canada at age four and was educated in Toronto at Toronto Normal School. Barr became a teacher and eventual headmaster of the Central School of Windsor, Ontario. While he had that job he began to contribute short stories—often based on personal experiences—to the Detroit Free Press. In 1876 Barr quit his teaching position to become a staff member of that publication, in which his contributions were published with the pseudonym “Luke Sharp.” This nom de plume was derived from the time he attended school in Toronto. At that time he would pass on his daily commute a shop sign marked, “Luke Sharpe, Undertaker”, a combination of words Barr considered amusing in their incongruity. Barr was promoted by the Detroit Free Press, eventually becoming its news editor.