ÃÂdhamh àCianáin (died 1373) was an Irish historian and genealogist.
Described in his obituary as "a learned historian" and "a canon" of Lisgoole, "having secured victory of deamon and world".
A member of the àCianáin learned family of Fermanagh, ÃÂdhamh studied under Seán Mór àDubhagáin; it was from the latter's book that ÃÂdhamh wrote Leabhar Adhamh àCianain ('The Book of Adhamh àCianáin') according to a colophon, whilst another states "Adhamh O Cianan ro sgribh in leabhar sa do fen/Adhamh àCianáin wrote this book for himself".
He and àDubhagáin had the responsibility of recording the genealogies of Irish Kings of the mid-Fourteenth Century.