Mariana Coelho (10 September 1857 – 29 November 1954) was a Portuguese Brazilian educator, essayist and poet, and a feminist pioneer in Brazil.
In 1908, she was awarded the silver medal at the National Exhibition in Rio de Janeiro for her book Paraná mental.
Later, in Curitiba, she was director of the Escuela Profesional Femenina República Argentina, founded in 1916, which was instrumental in the development of women's emancipation in the region.
She joined the Federación Brasileña para el Progreso Femenino (FBPF), participating in feminist conferences in 1922, 1933 and 1936.
Her most notable work was La evolución del feminismo: subsidios para su historia.