Louisa Stevenson (15 July 1835 – 13 May 1908) was a Scottish campaigner for women's university education, women's suffrage and effective, well-organised nursing.
Stevenson was born at Glasgow, the daughter of James Stevenson (1786–1866), a merchant of Glasgow and his wife Jane Stewart Shannan, daughter of Alexander Shannan, a merchant of Greenock. Louisa was one of a large family including her fellow-campaigner and sister Flora, the architect John James Stevenson, and MP James Cochran Stevenson. The family moved to Jarrow in 1844 when James Stevenson became partner in a chemical works. After he retired in 1854 the family moved to Edinburgh shortly before Mrs Stevenson died, and in 1859 they settled in a house in Randolph Crescent where Louisa, Flora, Elisa Stevenson (1829–1904), an early suffragist, and Jane Stevenson (1828–1904) spent the rest of their lives. Jane was a strong influence within the family but did not join in her sisters' activities beyond the home. After their father died leaving them comfortably off they were able to contribute financially to various causes.
Louisa Stevenson was a member of the Edinburgh Ladies' Educational Association (which later became the Edinburgh Association for the University Education of Women or EAUEW) and in 1868 she and Flora attended the first course of lectures for women given by Professor David Masson. This was the time when Sophia Jex-Blake was starting her campaign to open up medical education to women and Stevenson was honorary treasurer of a committee formed to support Jex-Blake and help with her legal costs. Stevenson's role in the EAUEW led to her giving evidence to a Commission on University Education, so contributing to the Universities (Scotland) Act 1889 which meant that Scottish universities were open to women students from 1892. This led to fund-raising for a women's hall of residence at Edinburgh University, the Masson Hall, which opened in 1897 with Louisa Stevenson as honorary secretary.