Colin Smith: The protagonist, a rebellious teenager from a working-class background who is sent to a Borstal (a type of youth detention center) after being caught stealing. He finds solace in long-distance running, which becomes a form of resistance against the authorities.

The Governor: The head of the Borstal, who sees Colin's running talent as a way to bring prestige to the institution. He tries to manipulate Colin into conforming and competing in a cross-country race.

Colin's Father: Deceased before the events of the story, his death affects Colin deeply.

Colin's Mother: Struggles with the family’s poverty and Colin's rebellious nature.