Edith How-Martyn, née How (1875, London -1954, Australia) was a British suffragette and a member of the Women's Social and Political Union (WSPU). She was arrested in 1906 for attempting to make a speech in the House of Commons. This was one of the first acts of suffragette militancy.
Edith How was born in London in 1875, an elder sister to Florence Earengey. She attended the North London Collegiate School and then University College, Aberystwyth where she took the associateship in Physics and Mathematics. She married Herbert Martyn in 1899, completing her BSc the following year. From youth, she had radical political opinions and was a member of the Independent Labour Party before becoming an early member of the WSPU in 1905. The following year she was appointed joint secretary of the WSPU with Charlotte Despard and it was in Oct 1906 that she was arrested in the lobby of the House of Commons and given a two-month sentence.
However, the future direction of the WSPU under the Pankhursts was a matter of some concern to her, as it was to other members at this time. In 1907, together with Charlotte Despard and others, she left the group to form the Women's Freedom League (WFL). This abandoned the violent tactics of the older group in favour of non-violent illegal acts to convey their message. She was honorary secretary of the new group from 1907 to 1911, when she became head of the Political and Militant section. However, she resigned in Apr 1912, disappointed with the WFL's progress after the defeat of the Conciliation Bill.
How-Martyn's next political act was to stand as an independent candidate in Hendon in the 1918 general election, an attempt in which she was unsuccessful. She held public office for the first time In 1919, when she became a member of the Middlesex County Council, a post she held until 1922. From then on, her interests were mainly directed to the issue of birth control. She met the American family planning leader Margaret Sanger in 1915 and had been impressed by her ideas, subsequently organising the 1927 World Population Conference in Geneva with Sanger and becoming honorary director of the Birth Control International Information Centre in London in 1930.
Between November 1934 and Mar 1935 How-Martyn travelled through India campaigning for birth control, then accompanied Sanger on her trip to Asia the following year. How-Martyn returned to the sub-continent several times in the following years to continue the work started there at this point.
However, her past campaigning for women's suffrage was not forgotten: in 1926 she also established the Suffragette Fellowship that began the process of documenting the movement. She continued this work in the following decades through a local branch in Australia which she established after she moved there with her husband at the outbreak of the Second World War. Norman Haire, who had returned to Australia, informed Margaret Sanger that How-Martyn hoped to 'join forces with him' to do something for birth control despite the war. Haire wrote to Sanger again on 9 September 1948, asking her to send money to support How-Martyn who was old, sick and poor.  She had a stroke and died in an Australian nursing home 
- Spartacus article on How-Martyn
- Margaret Sanger and Edith How-Martyn: An Intimate Correspondence, Margaret Sanger Papers Project Newsletter #5, Spring 1993
- Edith How-Martyn archive at The Women's Library at the Library of the London School of Economics