Dame Frances Lannon DBE FRHistS (born 22 December 1945) is a retired British academic and educator. She was Principal of Lady Margaret Hall, Oxford. Born in Newcastle-upon-Tyne, she was educated at Lady Margaret Hall (BA) and at St Antony's College (DPhil). After teaching at Queen Mary's College and holding a Fellowship at the Woodrow Wilson International Center for Scholars, she was in 1977 appointed Fellow and Tutor in Modern History at Lady Margaret Hall. She was Vice-Principal 1992–97 and became Principal in 2002. She retired on 30 September 2015.