Marie Dähnhardt (1818–1902), the daughter of an apothecary, was a German suffragette avant la lettre, for some time associated with the Berlin debating club Die Freien.
Dähnhardt was born in Gadebusch, now Mecklenburg-Western Pomerania, Germany.
She was married to the philosopher Max Stirner from 1843 to 1846. After divorcing she moved to London, and in 1852 to Australia. After returning to England she joined a Catholic commune, where she was found by Stirner's biographer John Henry Mackay, but refused to talk about her ex-husband and claimed, "Stirner was a very sly man whom she had neither respected nor loved, and claiming that their relationship together had been more of a cohabitation than a marriage". She died in 1902 in London.