Mary's father, a proud working-class man who becomes involved in trade unions and the Chartist movement, and whose personal struggles reflect broader social issues.

Mary Barton Sr.'s sister and Mary's aunt, whose life serves as a cautionary tale for Mary regarding the risks of seeking wealth through romantic means.

John Barton's close friend and a fellow working man, who empathizes with both the working class and the mill owners, highlighting a balanced perspective.

George Wilson's wife, who represents the physical and emotional toll of industrial labor, and remains a supportive figure to her family and Mary Barton.

George and Jane Wilson's son, known for his unwavering love for Mary, and a key figure in the narrative's exploration of loyalty and morality.

A kind and good-hearted young woman who is a friend to Mary and faces her own challenges with courage and wisdom, especially after losing her sight.

Margaret Jennings' grandfather and a mill worker, known for his intelligence and sensible character, who raises Margaret and offers a thoughtful perspective on social issues.

A wealthy mill owner who comes from a working-class background, yet has become disconnected from the struggles of his employees.

John Carson's son, a young man of privilege who interacts with Mary Barton and becomes a central figure in the unfolding events.