Julien is a 19-year-old peasant from the provincial town of Verrières with grand ambitions of social mobility. Deeply intelligent and a voracious reader, he idolizes Napoleon Bonaparte but realizes the military path is closed to him during the Bourbon Restoration. He cynically pursues a career in the Church as a vehicle for advancement, using his intellect and his ability to recite the Bible in Latin to secure a position as a tutor. He views the rigid class structures around him as battlefields to be conquered.

Mathilde is the beautiful, intelligent daughter of the Marquis de la Mole. Bored by the predictable noblemen who court her, she possesses a sharp wit and a deep fascination with her family's romantic history. She seeks passion and novelty, chafing against the constraints placed upon aristocratic women in Restoration France. She is drawn to Julien because his ambition and lack of traditional refinement distinguish him from her usual social circle.

Madame de Rênal is the cloistered, devoutly religious wife of the mayor of Verrières. Married to a venal man who values status over affection, she lives a comfortable but unfulfilled life. She is naturally empathetic and deeply moved by her new tutor's vulnerability. Her relationship with Julien introduces her to romantic love for the first time, though it also brings her into intense conflict with her religious beliefs.

The Marquis is a wealthy Ultra-royalist nobleman in Restoration-era Paris. Having survived the French Revolution by fleeing into exile, he is heavily invested in maintaining the conservative social order and participates in secret political meetings. Despite his strict adherence to aristocratic hierarchy, he recognizes talent and brings a peasant secretary into his household, trusting the young man with highly sensitive administrative tasks.

M. de Rênal is the conservative mayor of Verrières and a prosperous nail factory owner. He is obsessed with public perception, status, and petty rivalries. He hires a private tutor not for his children's educational benefit, but to display his wealth and humiliate his political opponents.

Sorel is a tough, wily peasant who operates a sawmill in Verrières. He is pragmatic and physically imposing, showing open disdain for his youngest son's habit of reading instead of performing manual labor. However, he recognizes an opportunity for profit and aggressively negotiates a favorable employment contract on Julien's behalf.

Abbé Pirard is the stern, devout head of the seminary in Besançon. A Jansenist who faces intense opposition from conservative factions within the Church, he is one of the few figures who recognizes Julien's academic talents. He becomes a vital protector, securing Julien a prominent position before political pressure forces him to resign.

M. de Valenod is the wealthy director of the poor house in Verrières and the primary rival of the town's mayor. Pompous and materialistic, he constantly attempts to outdo his peers in social displays. He eagerly uses gossip and anonymous letters to attack his enemies and elevate his own standing.

Fouqué is a pragmatic, successful timber merchant and a childhood friend of Julien. He operates outside the complex social ladders of the Church and the aristocracy. He repeatedly offers Julien a secure, profitable position in his business as an alternative to the dangers of ambition.

Madame de Fervaques is a wealthy, prudish widow in Parisian high society. She maintains strong ties to influential religious factions and values propriety above all else. She becomes the unwitting target of a calculated courtship designed purely for social manipulation.

Abbé Chélan is the elderly, principled local priest in Verrières. His liberal sympathies and associations with reformers put him at odds with the town's conservative leadership. He identifies Julien's sharp intellect and guides his early religious education, providing the boy with his first stepping stone out of the working class.

Élisa is a maid in the Rênal household. After receiving a small inheritance, she attempts to marry the new tutor but is firmly rejected. Her unrequited feelings quickly curdle into resentment, making her a dangerous source of gossip within the small town.

Prince Korasov is a worldly Russian aristocrat who befriends Julien. He views romance as a strategic game and offers cynical, detached advice on how to manipulate the affections of aristocratic women.

Count Altamira is a sincere liberal who has been condemned to death in his home country for his political beliefs. He lives in exile in Paris, where his genuine devotion to his ideals earns him the admiration of both Julien and high society.

Norbert is the jovial son of the Marquis de la Mole. He lacks his sister's sharp intellect and rebellious nature, comfortably inhabiting his role as a privileged young nobleman. He welcomes his father's new secretary without malice.

The Marquise de la Mole is the matriarch of an elite Parisian household. She hosts lavish salons filled with petitioners and aristocrats, representing the established, highly traditional core of Ultra-royalist society.

Madame Derville is a cousin of Madame de Rênal who visits the family's country estate. She is highly perceptive, viewing the household's new tutor with deep mistrust and attempting to protect her cousin from scandal.

Abbé Castanède is a conservative rival priest at the Besançon seminary. He leads a faction of students that marginalizes newcomers and actively works to undermine the seminary's headmaster.

Vicar-general de Frilair is a powerful, manipulative church official who pulls political strings from behind the scenes. He actively works against his rivals within the clergy and leverages his influence over local judicial and religious affairs.