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Murrough McDermot O'Brien (c.1550 - 20 April 1573) was the 3rd Baron Inchiquin. He was the son of Dermod O'Brien, 2nd Baron Inchiquin and Margaret O'Brien and inherited his title in 1557 on the death of his father.

He married Margaret Cusack, daughter of Sir Thomas Cusack of Cussington, Meath, Lord Chancellor of Ireland and his second wife Maud Darcy.

He was murdered in 1573 by Dermot O'Shaughnessey, supposedly at the instigation of Ulick Burke, 3rd Earl of Clanricarde.

He was succeeded by his son, Murrough O'Brien, 4th Baron Inchiquin.

Murrough MacMurrough O'Brien, 4th Baron of Inchiquin (1562 – 24 July 1597) was the son of Murrough McDermot O'Brien, 3rd Baron Inchiquin and Margaret Cusack, daughter of Sir Thomas Cusack of Cussington, Meath, Lord Chancellor of Ireland and his second wife Maud Darcy.

He married Mabel Nugent, daughter of Christopher Nugent, 6th Baron Delvin. He had one son; Dermod O'Brien, 5th Baron Inchiquin.

He was shot in 1597 when fording the River Erne near Sligo during the Nine Years War. When half across the ford, a bullet passed under one arm and out at the other. He fell from his horse and drowned.

He was buried at Donegal Abbey and was succeeded by his son, then only 2 years old.