Frank J. Lawless (10 October 1870 – 16 April 1922) was an Irish revolutionary and politician who served as a Sinn Féin Teachta Dála (TD) for Dublin North from 1919 to 1922. He was a farmer at Saucerstown, Swords, County Dublin, and a member of a widely connected North Dublin family identified with the National movement. He was an early member of Sinn Féin and of the Gaelic League. At the 1918 general election, he was elected as part of the Sinn Féin landslide, defeating the Nationalist J. J. Clancy, who had sat for the Dublin North seat since 1885, by 9,138 to 4,428.