Liliana Berry Davis Mumy (born April 16, 1994) is an American former child actress and ongoing voice actress. Between 2002 and 2006, Mumy appeared as a Jessica Baker in the two Cheaper by the Dozen movies, Lucy Miller in two films of The Santa Clause franchise and performed the voice of Mertle Edmonds in the Lilo & Stitch franchise.

Her father is actor Bill Mumy. Among his many roles, her father appeared as a child in the 1961 The Twilight Zone episode "It's a Good Life", and Liliana appeared with her father, as his child, in the revival series' 2003 sequel episode "It's Still a Good Life". She voices a lead character in the current (2012–present) animated television series Bravest Warriors, and has been joined by her father on some episodes.