Cathal Óg Mac Maghnusa (February 1439 – March 1498) was an Irish historian. He was the principal compiler of the Annals of Ulster, along with the scribe Ruaidhrí Ó Luinín. He was also chief of the McManus clan from 1488 to 1498.

• Lee, Sidney, ed. (1893). "Maguire, Cathal Macmaghnusa" . Dictionary of National Biography. Vol. 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

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