Natasia Charlotte Demetriou is a British actress, comedian and screenwriter. She is best known for her roles as Nadja in the FX horror comedy series What We Do in the Shadows (2019–present) and Sophie in the Channel 4 sitcom Stath Lets Flats (2018–2021).

What We Do in the Shadows is an American comedy horror mockumentary television series created by Jemaine Clement, first broadcast on FX on March 27, 2019. The series follows four vampire roommates on Staten Island and stars Kayvan Novak, Matt Berry, Natasia Demetriou, Harvey Guillén, Mark Proksch, and Kristen Schaal.