Guylaine St. Onge (June 1, 1965 – March 3, 2005) was a Canadian actress, model, and dancer. She was born in Saint-Eustache, Quebec, and raised in Saint-Hyacinthe. She began studying ballet at the age of four and later performed with a dance troupe in Montreal before moving into modeling and acting.

St. Onge began her screen career with a role in the Canadian television series Mount Royal in 1988. She went on to appear in several television productions, including a recurring role in Lonesome Dove: The Outlaw Years (1995–1996) and a leading role in the Showtime drama Fast Track (1997–1998). She also made guest appearances in series such as The Outer Limits, La Femme Nikita, and Mutant X.