Natasia Charlotte Demetriou is an English-Cypriot comedian, actress and screenwriter. She is best known for her roles as Nadja in the FX comedy horror series What We Do in the Shadows (2019-2024) and Sophie in the Channel 4 sitcom Stath Lets Flats (2018-2021).

In 2022, Demetriou co-wrote and starred in the BBC sketch show Ellie & Natasia, alongside her comedy partner Ellie White. The show was renewed for a second series in 2023. Natasia Charlotte Demetriou was born in London, the daughter of an English mother and Greek-Cypriot father. She was raised in North London. Her younger brother, Jamie Demetriou, is a comedian and actor with whom she often collaborates. She studied acting at the University of Leeds. Prior to becoming a professional comedian, Demetriou worked as a makeup artist, notably working on music videos for Boy Better Know.