Nanny Matilda Hammarström (March 23, 1870 – December 3, 1953) was a Finland-Swedish teacher and author.
[3][4] She taught mathematics, natural history, and geography at schools in Kokkola (1890–1891), Mariehamn (1895–1900), and Loviisa (1900–1943).
She gained an international foothold with her debut work Två myrors äventyr (The Adventures of Two Ants, 1906); the book was translated into Finnish, Norwegian, German, English, and Russian.
Her books are about the life and interaction of nature and animals, and Hammarström illustrated them herself.
The books Barn och vuxna I–II (Children and Adults I–II, published in 1918 and 1920), are about the author's own family.