Hilda Mary Dallas (1878–1958) was a British artist and a suffragette who designed suffrage posters and cards and took a leadership role for the Women's Social and Political Union (WSPU).

[1] A pacifist, she raised funds from a cross-section of society, produced and designed set & costumes for the 1929 Court Theatre production of the anti-war satirical play The Rumour.

[4] Her sister Irene Dallas was arrested with a WPSU protest group approaching the Prime Minister to ask for action on votes for women.

[1] Hilda Dallas was then seen encouraging others to join another Women's Social and Political Union protest on 30 June 1908, in a poster parade outside the House of Commons, with Dorothy Radcliffe, Charlotte Marsh and Dora Spong and selling the W.S.P.U.

[1] Dallas was seen with a megaphone and suffragettes Mrs May, Maud Joachim, Miss Harriett Ker disrupting the Oxford Cambridge Boat Race.

[8]In 1909, she designed a new publicity poster of a woman holding high the WSPU newspaper, ‘Votes for Women,’ with the price (one pence 1d) and the words Wanted Everywhere.

[22] On Christmas Day 1913, Hilda Dallas went with her sister Irene, and eleven other suffrage activist as guests to Paris to dine with Christabel Pankhurst, in the fashionable Restaurant Mollard, designed by Édouard Niermans,[23] and they ended by singing The March of the Women.

The aim was to ensure enough attendance to prevent a repeat of Black Friday when WSPU leader Mrs Pankhurst was manhandled, and many women injured.

[2] Dallas and her sister Irene, joined the Christian Scientists, and were registered as such at 77 Edith Road, Barons Court, London on 29 September 1939 at the start of World War Two.