Isabella Maria Susan Tod (18 May 1836 – 8 December 1896) was a Scottish-born campaigner for women’s civil and political equality, active in the north of Ireland. She lobbied for women’s rights to education and to property, for the dignified treatment of sex workers and, as an Irish unionist, for female suffrage. In 1887, her North of Ireland Suffrage Society helped secure the municipal vote for women in Belfast.