Elizabeth Clarke Wolstenholme Elmy (1833–1918) was an English suffragist, essayist and poet, who also wrote under the pseudonyms E and Ignota.
Elizabeth Wolstenholme was born in Cheetham Hill, Manchester and baptised on 15 December 1833 in Eccles, Lancashire where her father was a Methodist minister. She was the daughter of Revd Joseph Wolstenholme who died around 1843. Her mother Elizabeth had died when she was very young and she was brought up by her stepmother Mary (née Lord). She attended Fulneck Moravian School for two years but was not permitted to study further. Her brother Joseph Wolstenholme (1829–1891) became a professor of mathematics. She opened a private girls' boarding school in Boothstown near Worsley and stayed there until 1865 when she moved her establishment to Congleton in Cheshire. In 1865 she founded the Manchester Schoolmistresses Association.
In the 1870s Wolstenholme joined the National Secular Society and began a relationship with one of its vice presidents, Ben Elmy, whom she married shortly before the birth of their son Frank in 1874. Elmy had also been a school teacher but subsequently ran a mill producing silk cloth. In the UK census she is listed as "Elizabeth Woolstencroft" living with Benjamin Elmy.
Wolstenholme became an ardent feminist and vigorous campaigner for women's suffrage. She, along with fellow suffragist Josephine Butler, became secretary to the Married Women's Property Committee from 1867 until 1882, when the organisation was disbanded following their successful campaign to introduce the Married Women's Property Act 1882. Wolstenholme was also honorary secretary of the Manchester Society for Women's Suffrage in 1865, a founding member (with Harriet McIlquham and Alice Cliff Scatcherd) of the Women's Franchise League in 1889 and the founder of the Women's Emancipation Union in 1891.