Cathal Óg Mac Maghnusa (February 1439 – March 1498) was the principal compiler of the Annals of Ulster.
- Lee, Sidney, ed. (1893). "Maguire, Cathal Macmaghnusa". Dictionary of National Biography 35. London: Smith, Elder & Co.
- Cathal Óg Mac Maghnusa and the Annals of Ulster, by Aubrey Gwynn, in Clougher Record, 2/2 (1958) pp. 230–43 and 2/3 (1959), pp. 370–84. Ed. Nollaig Ó Muraíle, Enniskillen, 1998.
- Cathal Óg Mac Maghnusa: His Time, Life and Legacy, by Nollaig Ó Muraíle, in Clougher Record, pp. 45–64, 1998