A graduate in acting from the National Theatre School of Canada in 2014, Caroline Bélanger quickly launched into stage projects. She first appeared in Molière en deux temps, trois mouvements (La Comédie Humaine, dir. Martin Lavigne) and in Puss in Boots, a youth play by Théâtre Advienne Que Pourra (dir. Frédéric Bélanger).

That same year, she co-founded Théâtre du 2X4, and in 2015, she co-founded La Fille Du Laitier with Marie-Hélène Bélanger Dumas. She helped bring the project to life with passion, energy, and creativity, notably co-creating Caisse 606, the founding show that propelled the company in 2016.

After several years with La Fille Du Laitier, Caroline left her position in 2021 to fully pursue her acting career. However, she remains closely connected to the company: she currently serves as chair of the board of directors and continues performing Caisse 606, a show still on tour.

Alongside this, she lends her voice to various advertising campaigns, acts in short films, and appears on television (Olivier, District 31, Fragile, Contre-offre season 2).

She is currently performing in several productions: La Nuit du Caribou by Théâtre de la Petite Marée (dir. Francis Richard), Pride and Prejudice by Théâtre Advienne Que Pourra (dir. Frédéric Bélanger) at Théâtre Denise-Pelletier, and Monstres by Unuknu (dir. Marie-Andrée Lemieux), presented at Salle Fred-Barry and on tour.