Gearóid Mac Niocaill (1932–2004) was one of the foremost twentieth-century scholars and interpreters of late medieval Irish tracts.
His lifelong work in the Irish language built upon an earlier tradition of involvement in the Irish revival by English-born scholars like Robin Flower (Bláithín) and George Thomson (Seoirse Mac Tomáis).
Mac Niocaill graduated with a BA in Latin and French from the University of Leeds in 1953.
He submitted a dissertation entitled Cáipéisí i Dli i nGaeilge 1493–1621 in 1962 for which he was duly awarded his doctorate.
Nonetheless, his Na Buirgéisi, xii-xv aois (1964), written in Irish and Latin, is one of the most widely cited and indispensable texts on the burgesses and boroughs in late medieval Ireland.