Caroline Esmeralda van der Leeuw (born 26 April 1981 in Amsterdam), better known by her stagename Caro Emerald, is a Dutch jazz singer. She debuted on 6 July 2009 with her single "Back It Up". In week 32, 3FM Radio declared "Back It Up" a 3FM Megahit. She studied as a jazz vocalist at the Amsterdam conservatory of music and earned her degree in 2005.
Van der Leeuw is one of the six singers in Les Elles, a close-harmony vocal group from Amsterdam, and sings in the Philharmonic Funk Foundation, a Funk orchestra of 44 people. She also regularly performs background vocals on the Kinderen voor Kinderen (Children for Children) song festival. Caro teaches singing at the singing school of Babette Labeij, one of the vocal coaches on X-Factor and vocal conductor for Kinderen voor Kinderen.