Possibly a descendent of the Irish chemist Richard Chenevix, she studied at Alexandra College and then Trinity College Dublin. In 1911, she worked with Louie Bennett to form the Irish Women's Suffrage Federation. The two later founded the Irish Women Workers' Union.
Chenevix was also elected to Dublin Corporation, and twice served as acting Lord Mayor of Dublin (in 1942 and 1950). In 1951, she served as President of the Irish Trades Union Congress, and from 1955 she was Secretary of the Women Workers' Union. She was also active in the Women's International League for Peace and Freedom  and the Irish Pacifist Movement.
- Linde Lunney. "Chenevix, Richard". Dictionary of Irish Biography. (ed.) James McGuire, James Quinn. Cambridge, United Kingdom: Cambridge University Press, 2009. (http://dib.cambridge.org.ezproxy.londonlibrary.co.uk/viewReadPage.do?articleId=a1633)
- Frances Clarke. "Chenevix, Helen Sophia". Dictionary of Irish Biography. (ed.) James McGuire, James Quinn. Cambridge, United Kingdom: Cambridge University Press, 2009. (http://dib.cambridge.org.ezproxy.londonlibrary.co.uk/quicksearch.do;jsessionid=1ACD40C7A2BCA689F3A5B74724D4ADF0#)
- Angela Bourke, The Field Day Anthology of Irish Writing, Vol.5, p.566
- Kit and Cyril Ó Céirín, Women of Ireland: a Biographic Dictionary, p.41
- Mary Jones, These obstreperous lassies: a history of the IWWU. Dublin, Gill and Macmillan, 1988. (p. 22)
|Secretary of the Irish Women Workers' Union
|President of the Irish Trade Union Congress
James Larkin, Jnr