Tomás mac Maghnus Mág Samhradháin (anglicised Thomas McGovern) was lineage head of the McGoverns and Baron or Lord of Tullyhaw barony, County Cavan from 1512 until his death in 1532.
[1] He was the eldest son and his younger brother Uaithne Mág Samhradháin was also a chief of the clan from 1540.
During his reign the McGoverns were involved in border skirmishes with the Maguires.
The Annals of Ulster for 1532 state- Mag Samradhain died this year; namely, Thomas, son of Maghnus Mag Samradhain: to wit, a chief who was the best of those that came in Tellach-Echach within the memory of every one.
Tomás had at least two sons Maghnus na Cerrbhach (Manus 'The Gambler') and Brian.