James Williamson Galloway Macdonald (31 May 1897 – 3 December 1960), commonly known in his professional life as Jock Macdonald, was a member of Painters Eleven (Painters 11, or P11), whose goal was to promote abstract art in Canada. Macdonald was a trailblazer in Canadian art from the 1930s to 1960. He was the first painter to exhibit abstract art in Vancouver, and throughout his life he championed Canadian avant-garde artists at home and abroad. His career path reflected the times: despite his commitment to his artistic practice, he earned his living as a teacher, becoming a mentor to several generations of artists.