Toni Collett, credited professionally as Toni Collette, is an Australian actress and musician, known for her acting work on stage, television, and film as well as a secondary career as the lead singer of the band Toni Collette & the Finish. She has received six AACTA Awards, one Emmy Award and one Golden Globe Award, and has been nominated twice for a BAFTA Award and once for an Academy Award and a Tony Award.

Collette's acting career began in the early 1990s with comedic roles in films such as Spotswood (1992) and Muriel's Wedding (1994), for which she was nominated for a Golden Globe Award for Best Actress. She achieved international recognition as a result of her Academy Award-nominated portrayal of Lynn Sear in The Sixth Sense (1999) and a year later made her Tony Award-nominated Broadway debut with the leading role in the musical The Wild Party. In the 2000s, she was noted for her roles in independent features, including About a Boy (2002), for which she won several critics' awards and was nominated for a BAFTA Award, and Little Miss Sunshine (2006), which earned her a Screen Actors Guild Award as well as her second Golden Globe and BAFTA nominations. Her other notable films include Emma (1996), Velvet Goldmine (1998), Changing Lanes (2002), The Hours (2002), and Hereditary (2018).

From 2009 to 2011, she played the lead role in the television series United States of Tara, for which she won the Primetime Emmy Award and the Golden Globe Award for Best Actress in a Comedy Series. Collette returned to Broadway in Will Eno's The Realistic Joneses, for which she earned a Drama Desk Special Award.