Fanny Simonsen (née Françoise De Haes or Dehaes; c. 1835 – 19 September 1896), also written Fannie Simonsen, was a French soprano singer who had a substantial career on the Australian stage, later a concert manager with her violinist husband Martin Simonsen (c. 1829 – 28 November 1899). Several daughters and one grand-daughter, Frances Alda, were first-rate singers.