Jennifer Tilly (born Jennifer Ellen Chan; September 16, 1958) is an American actress and poker player. She is best known for her role as Tiffany Valentine in the Child's Play film series since 1998, for which she is regarded as an "icon" in the horror community. Her first notable acting role was in the sitcom Shaping Up (1984), after which she made her film debut that same year in the film The Fabulous Baker Boys. She is known for her distinctive voice and comic timing. Tilly is a winner of the World Series of Poker Ladies Event bracelet, the first celebrity to win a World Series tournament. She is the older sister of actress Meg Tilly.

Tilly rose to fame when she received an Academy Award nomination for her role as Olive Neal in Woody Allen's Bullets over Broadway (1994). Even greater recognition, as well as Saturn and MTV Award nominations for her role in the Wachowskis' neo-noir thriller Bound (1996), came from her performance. Her other film work includes Let It Ride; The Fabulous Baker Boys (1989); Made in America (1993); The Getaway (1994); Edie & Pen; House Arrest (1996); Liar Liar (1997); Music from Another Room (1998); Stuart Little (1999); Dancing at the Blue Iguana (2000); The Cat's Meow; Monsters, Inc. (2001); The Haunted Mansion (2003); Home on the Range (2004); and Terry Gilliam's Tideland (2005). She is also known for voicing Bonnie Swanson in the animated television series Family Guy (1999 – present).

In 1993, Tilly received the Theatre World Award for her role in the off-Broadway play One Shoe Off. Her other stage work includes Broadway revivals of The Women (2001) and Don't Dress for Dinner (2012).