Ida Mariette Helene Falbe-Hansen born Hansen (19 February 1849 – 23 September 1922) was a Danish educator, philologist and women's activist.

After a brief spell teaching at Vældegaard Kvindeskole in Gentofte, she travelled to London where she studied at the British Museum.

During this period, she also served as a member of the Board of Applied Sciences Examinations as well as a ministerial representative.

In collaboration with Elisabeth Grundtvig, she translated the works of the Swedish Nobel laureate Selma Lagerlöf.

As a literary historian, she published several works including Den ny Eventyrbog (1873) and Gamle danske Folkeviser (Old Danish Folksongs, 1917).