Edgeworth Lysaght, later Edward Anthony Edgeworth Lysaght, and from 1920 Edward MacLysaght (Irish: Éamonn Mac Giolla Iasachta; 6 November 1887 – 4 March 1986) was a genealogist of twentieth century Ireland. His numerous books on Irish surnames built upon the work of Rev. Patrick Woulfe's Irish Names and Surnames (1923).