Ellen (Eleonora) Anckarsvärd, née Nyström (1833–1898), was a Swedish women's rights activists.
She was the daughter of the architect Per Axel Nyström. In 1873, she co-founded Föreningen för gift kvinnas äganderätt (The Married Women Property Right Association) with Anna Hierta-Retzius, which is considered the first organized Swedish women's movement. According to Anna Hierta-Retzius, she was the center of the organisation with her intellect and efficiency. In 1884, she also co-founded Fredrika-Bremer-förbundet (The Fredrika Bremer Association), the main Swedish feminist movement of the 19th-century; in 1896, she became its Vice Chairman, and she is referred to as the successor of Sophie Adlersparre. According to Ellen Key, she was a good organizer, for which no juridical or practical problem was to difficult to solve.
- Österberg, Carin et al., Svenska kvinnor: föregångare, nyskapare (Swedish women: Predecessors, pioneers) Lund: Signum 1990. (ISBN 91-87896-03-6)