Katharine Blake (born 1970) is a British singer, songwriter and musician, originally from London. She is the lead singer of gothic rock band Miranda Sex Garden, and is a founding member, singer, and musical director of the musical group Mediæval Bæbes.

She was married to Nick Marsh, the lead singer of rock band Flesh for Lulu, until his death in 2015. Their first child was born in February 2007. Their second daughter was born in 2009.

In 2006 Stories From the Moon, an ethereal collaborative concept album, by Miranda Sex Garden's guitarist Ben Golomstock was released. It included contributions from Katharine Blake.

In 2015, Katharine Blake and Nick Marsh's collaborative self-titled album From The Deep was released on Bellissima Records. It included contributions from many of their musical past working, including members from Miranda Sex Garden, Naked Goat and Mediæval Bæbes.

In 2021, Katharine Blake and her partner Michael J. York (Coil, Current 93, The Utopia Strong, Teleplasmiste) have released a self-titled debut album of their experimental electronic folk project The Witching Tale. In 2023 they have released their second album What Magic Is This?