Hilda Maria Käkikoski (31 January 1864 – 14 November 1912) was a Finnish politician, writer and schoolteacher.

[1][2] After finishing school, she worked as a home tutor until 1888 when she enrolled in university; she completed a PhD in Finnish and Nordic history in 1895.

[1] Her students found her fascinating due to her unconventional habits and interests, such as being a vegetarian, gymnast, cyclist, wearing masculine clothing and having an assertive demeanor.

[1] Käkikoski's literary work included children's songs, poetry and short stories.

Later in life, Käkikoski was romantically involved with her married friend Hildi Ennola, her American friend Frances Weiss, deaconess Hanna Masalin, and political activist Helmi Kivalo; Käkikoski maintained involvement in all of these relationships until her death in 1912.