Tyyni Maria Tuulio (née Haapanen; 28 August 1892, in Karvia – 9 June 1991, in Helsinki), was a Finnish writer and translator.

[1] Tuulio was the daughter of vicar Jaakko Haapanen and Hilma Antoinette Rikberg.

[2][3] She published travel writing and short stories as well as biographies of prominent Finnish women, such as Sophie Mannerheim (1948), Ottilia Stenbäck (1950), Alexandra Gripenberg (1959) and Maila Talvio (two volumes, 1963–1965).

[1] Tuulio is counted among Finland's most influential twentieth-century literary translators.

[4] She translated from Swedish (the collected works of Fredrika Runeberg), English (Charlotte Brontë, Louisa May Alcott) and the Romance languages (Dante Alighieri's La Vita Nova).