Mary Elizabeth Byrne, M.A. was an Irish linguist, author, and journalist.
She translated the Old Irish Hymn, "Bí Thusa 'mo Shúile," into English as "Be Thou My Vision" in Ériu, in 1905.
A linguist, Byrne received her education from the Dominican Convent in Dublin, and the National University of Ireland, where she graduated in 1905. She received the Chancellor's Gold Medal at the Royal University of Ireland. She worked for the Board of Intermediate Education, and helped compile the Catalog of the Royal Irish Academy. She also contributed to the Old and Mid-Irish Dictionary and Dictionary of the Irish Language, and wrote a treatise on England in the Age of Chaucer.