Fiona Christianne Dourif (born October 30, 1981) is an American actress and producer. She is best known for her starring role as Nica Pierce in the Child's Play franchise, including the horror film Curse of Chucky (2013), its sequel Cult of Chucky (2017), and the series Chucky (2021–24). She appears in these works alongside her father, Brad Dourif, who portrays the series' main antagonist.

Dourif starred as Bart Curlish in the BBC America science fiction series Dirk Gently's Holistic Detective Agency (2016–2017) , as Diane Jones in ABC miniseries When We Rise (2017), and Dr. Cassie McKay in the Max medical drama The Pitt (2025). She had recurring roles in the HBO fantasy drama series True Blood (2011), the NBC crime thriller series The Blacklist (2018–2021), the USA Network action horror series The Purge (2018), and the CBS All Access miniseries The Stand (2020).

Dourif also appeared in films such as Garden Party (2008), The Master (2012), Fear Clinic (2014), Blood Is Blood (2016), Tenet (2020), The Shuroo Process (2021), Don't Look at the Demon (2022), and Unsinkable (2024).