I Shall Wear Midnight is an Andre Norton Award-winning comic fantasy novel by Terry Pratchett set on the Discworld. It is the fourth novel within the Discworld series to be based around the character of Tiffany Aching. It centres on Tiffany Aching, who is now fifteen years old and getting on with the hard work of being a witch. The title is taken from a quotation in A Hat Full of Sky.