Thomas James Clarke (11 March 1858 – 3 May 1916) was a leader of the Irish Republican Brotherhood and played a major role in the organisation of the 1916 Easter Rising. Clarke spent fifteen years in English prisons. Clarke was one of seven signatories of the Irish Proclamation. He faced arrest in the aftermath of the Easter Rising and was sentenced to be shot. He was executed by firing squad on 3 May 1916.