Thomas Kelly (13 September 1868 – 20 April 1942) was an Irish Sinn Féin and later Fianna Fáil politician. He was a book and picture dealer before entering politics. He was a founder member of Sinn Féin and was elected to Dublin City Council in 1899. Kelly was arrested after the 1916 Easter Rising and sent to prison in England, and after becoming seriously ill, he was released back to Dublin. Kelly was unanimously elected as Lord Mayor of Dublin while being held in Wormwood Scrubs prison in England. Due to his imprisonment, he was unable to formally take up the position.