Ria Bollen (born 11 February 1942) is a Flemish contralto, who had an international career as a concert singer between 1965 and 1992. Her broad repertoire included Bach's Passions, Mozart's Requiem, Beethoven's Missa solemnis, especially works by Gustav Mahler and works of the 20th century. She was the soloist in the world premiere of Frank Martin's Requiem. She sang many art songs, including by Belgian composers.