Alicia Roanne Witt (born August 21, 1975) is an American actress, singer-songwriter, and pianist. She first came to fame as a child actress after being discovered by David Lynch, who cast her as Alia Atreides in his film Dune (1984) and in a guest role in his television series Twin Peaks (1990).

Witt later had a critically acclaimed role as a disturbed teenager in Fun (1994), and appeared as a music student in Mr. Holland's Opus (1995), and as a college coed in the horror film Urban Legend (1998). She then appeared in Cameron Crowe's Vanilla Sky (2001), Last Holiday (2006), and the thriller 88 Minutes (2007). Witt has made television appearances in The Walking Dead, The Sopranos, Nashville, Two and a Half Men, Friday Night Lights, Law & Order: Criminal Intent, Cybill, and Justified. In addition to acting, Witt has been described as a musical prodigy, as an accomplished pianist, singer, and songwriter. She released her self-titled debut album in 2009. Witt has also appeared in ten Hallmark Channel movies.