Fabianne Therese Gstottenmayr is a Sri Lankan-American actress and director, known for roles in several successful independent films, including Netflix's Teenage Cocktail (2016), John Dies at the End (2012), Anchor Bay's The Aggression Scale (2012), A Glimpse Inside the Mind of Charles Swan III (2013), and the AMC web series The Trivial Pursuits of Arthur Banks (2011).

Therese's family moved frequently while she was growing up, including to Austria, Sri Lanka, Abu Dhabi, and Palm Springs. She initially focused on becoming a runner before turning to acting. She is the great-great-granddaughter of Ceylonese newspaper editor and democratic activist Armand de Souza.