Dermod McMurrough O'Brien (died 1 May 1557) was the 2nd Baron Inchiquin. He was the son of Murrough O'Brien, 1st Earl of Thomond and Eleanor FitzGerald. O'Brien married Margaret O'Brien, daughter of Donough O'Brien (Prince of Thomond)(a son of Murrough O'Brien, 1st Earl of Thomond and Slany McNamara).
He died at Ennis Abbey in 1557. The title passed to his son Murrough McDermot O'Brien, 3rd Baron Inchiquin.
| Peerage of Ireland | ||
|---|---|---|
| Preceded by Murrough O'Brien |
Baron Inchiquin -1557 |
Succeeded by Murrough O'Brien |