Nanny Matilda Hammarström (March 23, 1870 – December 3, 1953) was a Finnish teacher and author. Hammarström was born in Vaasa. She taught mathematics, natural history, and geography at schools in Kokkola (1890–1891), Mariehamn (1895–1900), and Loviisa (1900–1943). She was active in a variety of roles in the community and society in Loviisa; she was a member of the town council from 1919 to 1923, and she became the chair of the town library board in 1930. Hammarström died in Loviisa, where she is also buried.