Tricia Janine Helfer (born April 11, 1974) is a Canadian-American actress and former model. She played the enigmatic Cylon model Number Six in the re-imagined Battlestar Galactica series (2004–2009). She also voiced Sarah Kerrigan in StarCraft II and its expansion packs (2010–2015). She played Charlotte Richards/the Goddess of All Creation on the TV series Lucifer (2016–2021).

Early life
Helfer was born in rural Donalda, Alberta, Canada, to Dennis and Elaine Helfer. She is of German, English, Swedish and Norwegian descent.

She studied at William E. Hay Composite High School in Stettler, Alberta. She lived and worked on the family's grain farm with her three sisters: Trena, Tammy and Tara.

Helfer was discovered at age 17 by a modeling agency scout while standing in line at a movie theatre.