Kate Gordon Siegelbaum, known professionally as Kate Siegel (/ˈsiːɡəl/ SEE-gəl, born 9 August 1982), is an American actress and screenwriter. She is best known for her collaborations with her husband, filmmaker Mike Flanagan, appearing in his films Oculus (2013), Hush (2016; she also wrote the screenplay with him), Ouija: Origin of Evil (2016), and Gerald's Game (2017), as well as in his television series The Haunting of Hill House (2018), The Haunting of Bly Manor (2020) and Midnight Mass (2021). She has been dubbed a "scream queen" due to her work in horror films and television.

Life
Siegel was born on 9 August 1982 in Silver Spring, Maryland. She attended St. Andrew's Episcopal School in Maryland, and graduated from Syracuse University in 2004. Siegel is Jewish. Siegel said in 2008 she was bisexual and had been in relationships with other women before. She married director Mike Flanagan in early 2016. They have two children: a son, Cody, and a daughter, Theodora, named after Siegel's character in The Haunting of Hill House. She is stepmother to Flanagan's eldest son from a previous relationship. She attended high school with stand-up comedian and actress Whitney Cummings.