Morissette was born June 1, 1974 in Ottawa, Canada, the daughter of Georgia Mary Ann (née Feuerstein), a teacher, and Alan Richard Morissette, a high school principal.

She has two siblings, one of whom is a twin brother, Wade Morissette (also a musician), who was born 12 minutes after her. Her father was of French-Canadian and Irish descent and her mother was of Hungarian ancestry. Morissette had a Catholic upbringing. She attended Holy Family Catholic School for elementary school and Immaculata High School for Grades 7 and 8 before completing the rest of her high school at Glebe Collegiate Institute (Ottawa, Canada).

Alanis Morissette's Family Tree