Martha Margaret Mildred Simpson (pen name, Innisfail; 3 May 1865 – 7 June 1948) was an Irish-born Australian educational theorist and poet.

[6] Simpson was also responsible for the kindergarten section of Blackfriars Demonstration School, part of the Sydney Teachers' College.

[1] Her early students included Amy Rowntree, who would carry the kindergarten message on to Tasmania.

[7] In 1920, Simpson travelled to the US to further study education methods,[6] and returned with ideas on improving the health of students.

[8] Simpson retired from education in 1930 and the following year unsuccessfully stood for election for the New South Wales district of Annandale.