Murrough McDermot O'Brien (c.1550 - 20 April 1573) was the 3rd Baron Inchiquin.
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.
[1] He was succeeded by his son, Murrough O'Brien, 4th Baron Inchiquin.
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