This article examines Irish nationalist girl scouts in the period 1911‒23 with a particular focus on the organisation Clan na Gael (or Clann na nGaedheal). It illuminates the involvement of girls in Irish nationalist youth organisations in the early twentieth century and situates them in the wider contexts of uniformed youth groups and the Irish nationalist movement during this period. Like their male counterparts in Na Fianna Éireann, Irish nationalist girl scouts received forms of military training and provided military support services to their adult colleagues in the Irish independence movement. Thus, these Irish girls challenged the gender conventions of the time more overtly than members of the international Girl Guide movement. Participation in these groups could also serve as a conduit to future membership and activism in Cumann na mBan or the Irish Citizen Army. The contributions of Clan na Gael and other girl scouts to the Irish nationalist movement demonstrate that girls as well as boys sought to further the struggle for Irish independence. Yet these adolescent female activists have received far less recognition for their efforts. This may be due to their relatively small numbers, dismissive preconceptions of their contribution, and the sparsity of primary source material.