• Ellen Page as Juno MacGuff, the birth mother of her child, Paulie’s girlfriend, Bren’s stepdaughter and Mac’s daughter.
  • Michael Cera as Paulie Bleeker, the father of Juno's child, and Juno's boyfriend.
  • Jennifer Garner as Vanessa Loring, Mark's wife and the prospective adoptive mother of Juno's child
  • Jason Bateman as Mark Loring, Vanessa's husband and the prospective adoptive father of Juno's child
  • Allison Janney as Bren MacGuff, Juno's stepmother
  • J. K. Simmons as Mac MacGuff, Juno's father
  • Olivia Thirlby as Leah, Juno's friend
  • Candice Accola as Amanda
  • Rainn Wilson as Rollo
  • Valerie Tian as Su Chin, the lone pro-life protester

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