Frank Ryan (; 11 September 1902 – 10 June 1944) was an Irish politician, journalist, intelligence agent and paramilitary activist. He first came to prominence as an Irish republican activist at University College Dublin and fought for the Irish Republican Army during the Irish Civil War. Ryan fell under the influence of Peadar O'Donnell, an advocate of Marxist-Leninism within Irish republicanism, which resulted in him breaking with the IRA and becoming involved with founding a new political organisation, the Republican Congress, and editing its associated newspaper: "An Phoblacht".