Adelheid Maria Eichner (1762–1787) was a German composer, singer and pianist who was noted during her brief lifetime for her fine three-octave singing voice and vocal technique. She was the only child of bassoonist and composer Ernst Eichner and his wife, Maria Magdalena Ritter. Critics claim her compositions to be more effective instrumentally than vocally. As a composer, Adelheid Eichner had difficulty combining words and music effectively.