Isabella May (née Malcolm; 22 June 1850 – 1 May 1926) was a New Zealand temperance worker, suffragist and dress reformer.
May was born in Hoxton, London, England, on 22 June 1850, and was the younger sister of suffragist Kate Sheppard.
[3][4] May joined the Christchurch branch of the Women's Christian Temperance Union New Zealand (WCTU NZ) when it was first formed under the guidance of Mary Clement Leavitt in 1885.
She spoke at a meeting of the Society for the Abolition of the State Regulation of Vice at which the British activist Josephine Butler was president.
She continued her leadership in the WCTU NZ and campaigned against the Contagious Diseases Acts of 1869 still on the books in New Zealand.