 Phaedrig O'Brien, 17th Baron Inchiquin

Phaedrig Lucius Ambrose O'Brien, 17th Baron Inchiquin (4 April 1900 - 1982) was the holder of a hereditary peerage in the Peerage of Ireland, as well as Chief of the Name of O'Brien and Prince of Thomond in the Gaelic Irish nobility.He was a geologist.