Johanna Friederieke Louise Dittmar (September 7, 1807 – July 11, 1884) was a German feminist and revolutionary philosopher.
Along with more general advocacy of equality for women, social justice, and a radical and near-atheist approach to religion, her works "in a manner unique for her time repeatedly and brilliantly questioned the notion of 'natural' differences between the sexes".
She was one of ten children of a treasury official for the Grand Duchy of Hesse, had no formal education, and was the only daughter to remain unmarried,[1][2] in part because her father's salary could not extend to a dowry for her.
[1][2][3] After the failure of the German revolutions of 1848–1849 and consequent suppression of liberal views, she left public life.
She moved in with two younger relatives in 1880, and died on July 11, 1884, in Bessungen, largely forgotten.