Karen Mantler (born 25 April 1966, New York City, New York, United States) is an American jazz musician (piano, organ, chromatic harmonica), singer and composer. She is the daughter of Carla Bley and Michael Mantler. Her musical debut consisted of contributing vocals on Carla Bley’s albums Escalator Over the Hill (1971) and Tropic Appetites (1972). She then continued performing and recording on glockenspiel, organ and chromatic harmonica in many of Carla Bley’s ensembles and projects from 1977 on to the present.