Lucille Frances Lawless, (née Ryan; born 29 March 1968) is a New Zealand actress and singer. She portrayed the title character in television series Xena: Warrior Princess (1995–2001), Number Three on the re-imagined Battlestar Galactica series (2005–2009) and Lucretia in the television series Spartacus: Blood and Sand (2010), its prequel Spartacus: Gods of the Arena (2011) and its sequel Spartacus: Vengeance (2012).
Lawless had recurring roles as Diane Lewis on the NBC sitcom Parks and Recreation (2012–2015), and as Countess Palatine Ingrid Von Marburg on the WGN America supernatural series Salem (2015). She also starred as Ruby on the Starz horror-comedy series Ash vs Evil Dead (2015–2018).