Marie Nicolina Theodora Rovsing née Schak (1814–1888) was a pioneering Danish women's rights activist.
From 1871 to 1888 she was a board member of the Danish Women's Society, serving as president from 1883 to 1887.
Interested in allowing women to practise crafts and manual work traditionally reserved for men, on her death she left a legacy which among other things allowed two women to be the first in Denmark to qualify as carpenters.