Francis Stewart Leland Lyons FBA was an Irish historian and academic who served as the 40th Provost of Trinity College Dublin from 1974 to 1981. He was educated at Dover College in Kent and later attended The High School, Dublin. At Trinity College Dublin, he was elected a Scholar in Modern History and Political Science in 1943. Lyons was a lecturer in history at the University of Hull and then at Trinity College Dublin. He became the founding Professor of Modern History at the University of Kent in 1964, serving also as Master of Eliot College from 1969 to 1972.