Isabelle Boulay, born 6 July 1972 in Sainte-Félicité, Quebec, is a francophone Canadian pop singer.

In 1990, some friends registered her at the Petite-Vallée song festival without her consent, but she completed a performance there and was regarded as a huge success. The following year she won at the Granby song festival for her rendition of Jacques Brel's "Amsterdam". That same year she was invited to take part in the festival Les FrancoFolies de Montréal.

In 1993 she represented Radio Canada at the "Truffe de Périgueux" festival held in Périgord, France. She carried off the prize for Best Singer in the "chanson francophone" (francophone song) category. Following her success in France, she was noticed by songwriter Luc Plamondon who was looking for emerging talents to perform in a new production of his rock opera Starmania. There, Boulay portrayed the role of Marie-Jeanne.

In 1996, Isabelle Boulay provided the singing voice for Alys Robi in the television series of the same name. She released her debut album, Fallait pas, that year.