The Lord Inchiquin | |
|---|---|
 Sir Lucius O'Brien, the Right Honourable 15th Baron Inchiquin, in his robes as a peer of the Realm | |
| Baron Inchiquin | |
| In office 9 April 1900 – 9 December 1929 | |
| Preceded by | Edward O'Brien |
| Succeeded by | Donough Edward Foster O'Brien |
| Personal details | |
| Born | Lucius William O'Brien 21 June 1864 Bishop's Waltham, United Kingdom |
| Died | 9 December 1929 (aged 65) London, United Kingdom |
| Spouse |
Ethel Jane Foster (m. 1896) |
| Children | 6, including Donough Edward Foster O'Brien, 16th Baron Inchiquin and Phaedrig Lucius Ambrose O'Brien, 17th Baron Inchiquin |
| Parent |
|
| Relatives | Conor Myles John O'Brien, 18th Baron Inchiquin (grandson) |
| Education | Eton College |
| Military service | |
| Allegiance |  United Kingdom |
| Branch/service |  British Army |
| Years of service | 1885–1893 |
| Rank | Lieutenant |
Lucius William O'Brien, 15th Baron Inchiquin (21 June 1864 – 9 December 1929) was the England-born 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.