Aafje Heynis (born 1932) is a Dutch mezzo-soprano renowned for her contributions to classical music, particularly in the fields of opera and concert performance. She gained prominence in the 1950s and 1960s, becoming known for her interpretations of works by composers such as Bach, Handel, and Mahler. Notable works include her recordings of Bach’s "St. Matthew Passion" and "St. John Passion," as well as Mahler's "Das Lied von der Erde." Heynis's rich, expressive voice and her ability to convey deep emotion have earned her critical acclaim and a devoted following. She has performed with leading orchestras and conducted numerous recitals, showcasing her versatility across various musical styles. In addition to her performance career, Heynis has made significant contributions to music education, mentoring young singers and advocating for the development of classical music in the Netherlands. Her impact on the genre can be seen in her commitment to bringing classical music to a wider audience and her influence on subsequent generations of singers. Aafje Heynis remains a respected figure in the classical music community, celebrated for her artistry and dedication to her craft.