Leslie Mary de Barra was an Irish nationalist and republican active during the Easter Rising of 1916, the War of Independence and the Civil War, becoming Director of Cumann na mBan. She went on to be chairman and President of the Irish Red Cross.

Cumann na mBan, abbreviated C na mB, is an Irish republican women's paramilitary organisation formed in Dublin on 2 April 1914, merging with and dissolving Inghinidhe na hÉireann, and in 1916, it became an auxiliary of the Irish Volunteers. Although it was otherwise an independent organisation, its executive was subordinate to that of the Irish Volunteers, and later, the Irish Republican Army.