Antoinette "Toni" Halliday (born 5 July 1964) is an English musician best known as the lead vocalist, lyricist, and occasional guitarist of the alternative rock band Curve, along with Dean Garcia.
She was also a member of the bands Photofitz, The Uncles, State of Play and Scylla. Halliday released solo work as Toni Halliday and Chatelaine. She collaborated with artists like Robert Plant, Recoil, The Future Sound of London, Leftfield, Paul van Dyk, Freaky Chakra, DJ? Acucrack, Headcase, The Killers, Acid Android, and Orbital.
Halliday has a contralto vocal range.