Gilsig was born in Montreal, Quebec, Canada, the daughter of Claire, a writer and translator, and Toby Gilsig, an engineer. She began her acting in a voice work part at age 12 for a National Film Board of Canada production, Masquerade. She is of Jewish descent.
Gilsig attended McGill University in Montreal, from 1989 to 1993, graduating with a Bachelor of Arts degree in English in 1993. She later pursued her acting studies further at Harvard University's Institute for Advanced Theater Training.
Gilsig began her career as a voice actress. She has done voices in the films such as Masquerade, and for television series such as Young Robin Hood.

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